Goofs

When Kevin is recording the Plaza Hotel commercial with his TalkBoy and it says the toll free number, Peter walks in and asks about the battery for the camcorder, overlapping it; yet when Kevin plays it back at the hotel, Peter's voice is not included on it.

When Kevin is on the bed in the hotel room, we see the butler scooping ice cream into the banana split boat, then the butler asks Kevin, "How many scoops would you like, sir?" and the banana split boat is empty and the butler starts to fill it up.

The recording of Uncle Frank singing in the shower is much longer when Kevin plays it back in the Plaza Hotel. We hear what was sung before and after Kevin started and stopped the recording.

When Kevin meets Marv and Harry outside the toy store, he drops his map and magnifying glass on the pavement. When he later runs away, these items are not there.

In the first movie, when Kevin is shopping, he tells the cashier he is eight years old. In this movie, he tells the bellhop when he is escorted to his hotel room that he is ten years old. This movie takes place exactly one year later, so Kevin should be nine in this movie, not ten.

When Kevin soaks the rope in kerosene, he later lights it on fire to deter Harry and Marv. Given the evaporative nature of kerosene, the volatility would be so low, the rope would barely light, if at all.

When Kevin goes swimming at the Plaza, it is a different hotel. The Plaza doesn't have a pool.

When Harry uses a toilet bowl (unknowingly filled with kerosene) to extinguish his burning hair, he positions himself vertical in order to reach the liquid; this would have lit his clothes on fire, given the vertical flame.

During Harry and Marv's attempt to scale the stairs, they have a direct line of sight straight to Kevin. Soon after Harry and Marv are struck with the large pipe, Kevin is seen cutting the pipe's rope loose. However, in this scene, Kevin is no longer visible, implying that the hole is further away. It is also unexplained how Kevin is able to move the immense pipe. Finally, when Kevin first throws the pipe, the angle that it swings it implies a short rope, meaning that the pipe would have started moving backwards.

When Harry and Marv are hit by the pipe after the paint cans miss them, the ropes are shown attached to the banister to the right of the stairs. There is no way they could swing straight down the stairs from where they are attached.

Kevin is seen buying fireworks in Chinatown when he first arrives in New York City. It is illegal to buy or sell fireworks in the state of New York, but when this movie was made, that law was not enforced in Chinatown and it was easy to find vendors there selling fireworks illegally while the police looked the other way.

At the airport, Kevin has his father's bag as he boards the plane for NYC. Then it is by his own bag showing up at the baggage claim, in Florida, that Kevin's family realizes he's not with them. So he wouldn't have had the inflatable clown with him to use in the Plaza as a ruse in the shower. It wasn't in his father's carry-on bag, so it would've been in Kevin's bag that went to Florida.

Kevin has his own carry on bag and he slips his father's bag into his.

In the original film, Kevin's cousin Heather counts heads and there are 15 people between the two families. In this film, there are only 14 boarding passes between the two families. However, in the first movie, the McCallisters travel to Paris to drop Heather off with her parents. Therefore, in the second film, it is implied that Heather is in Paris during the events that take place in this film.

When Kevin encounters Marv and Harry outside the toy store, the camera zooms in on Kevin's bag with the name "K McCallister" embroidered on it. However, it should have read "P McCallister" because this is his father Peter's bag; Kevin was holding it since the family arrived at the airport and it contains all of Peter's money and his ID.

Incorrectly regarded as goof: At the original airport scene, Kevin has his own backpack. When he is on the plane, he is seen putting his father's backpack inside his own. Hence the initials are correct.

When the thieves are crossing the street and bump into a woman, Marv says: "mon chérie". The correct expression should be "ma chérie" ("mon" is masculine and "ma" is feminine in French). However Marv is an idiot and it's completely in character for him to make that mistake.

The Roman candles Kevin lights in the park are not remotely capable of firing projectiles of the size and intensity shown.

When the tool chest pushes the door Marv and Harry have their ears pressed against, the long shot clearly reveals that they are standing on a skateboard as they are pushed backwards.

A black wire of some sort can be clearly seen connected to the staple that hits Marv's nose.

When Kevin uses the inflatable clown like a puppet, the strings are thick enough; they should leave shadows like the clown does, but they do not.

When Kevin is sawing a ladder, he is sawing it from front to back. Later when Harry climbs the ladder, the sawed portion (back side of ladder) shows it was cut from side to side.

Harry's newspaper has a date of Wednesday, December 24, 1992. December 24 in 1992 fell on a Thursday.

In O'Hare Airport, the wrong Peter McCallister is seen purchasing at a kiosk with March 1992 issues of "Cosmopolitan", "Good Housekeeping", "Glamour", and "Vogue" magazines visible. The film is set in December 1992 (this is established by the Plaza Hotel ledger when the the concierge checks Peter's credit card).

At the end of the film, when the children are running up the stairs, the sound of bare feet slapping on a smooth floor can be heard on the soundtrack, although the children are all in socks or slippers and running on carpet.

When Kevin and the bird lady go to Carnegie Hall's attic where she lives, a different song was dubbed over the ones the violinists played when the camera shot the orchestra. You can tell by the bow movements and bow direction changes.

Near the end of the movie when all the kids are in the penthouse room, Buzz yells to try to quiet everyone down. He then blows on his fingers to whistle to get everyone's attention but only a faint raspberry blowing sound is made. In the next shot, everyone is paying attention to him.

When Kevin lights the rope on fire, he turns to run away and a crew member is visible through the window.

Orange wire visible for two or three frames, when Harry falls onto the car. Lighting equipment can be seen on one of the car's windows.

When Harry and Marv run out the toy store's broken window, near the end of the movie, there are several shots of them where we see into the store behind them. In one of these shots, we see a person's left shoulder move behind a display on the left side of the screen (the person is wearing a heavy green jacket).

When Kevin is sitting at LaGuardia Airport, he is looking at the Manhattan skyline. That view of the city cannot be viewed from LaGuardia.

When Kevin arrives at LaGuardia airport he arrives at gate G6. There is no G wing at LaGuardia Airport, plus the lettering style is the same as it was at O'Hare, indicating that it was in fact filmed at O'Hare.

When Kevin gets in the limo at the Plaza Hotel, he asks the driver if he knows of any good toy stores, and he's driven to Duncan's Toy Chest. However, the Plaza Hotel is directly across the street from FAO Schwarz (on which Duncan's Toy Chest was based), so Kevin need only look outside and wouldn't have had to be driven anywhere.

Kevin in a montage is seen travelling around New York City and goes to or sees some of the sights, but there is no way Kevin could had done all that in just a short time as New York City is one of the biggest cities in the world. It would had taken a lot longer than that.

At their motel in Florida, while waiting for news about Kevin, the McCallisters watch a Spanish-dubbed version of It's a Wonderful Life (1946), but a foreign-dubbed version wouldn't be necessary within the United States, since English is the country's de facto national language.

At Central Park where the pigeons are feeding on Marv and Harry, Kevin lights fireworks that do not scare the birds away. However, when the police come, they fire one shot in the air which scares all the birds away.

Kevin's parent's alarm clock fails to go off just like the first film, causing the entire house to scramble to get to the airport on time. However, in the first film, a power outage caused the entire house to lose power. Here, only Kevin's parent's clock failed (after Peter accidentally unplugged it himself). It would make no sense for the rest of the family members in the house to not have set their own alarms, thus ensuring somebody would have woken up on time.

Mr. Duncan would not have known how many people were in Kevin's family or who they were. He would not have known who to wrap gifts for to leave in the hotel suite.

It seems highly unlikely that the entire family managed to get a last-minute flight from Miami to New York on Christmas Eve as this would be an incredibly busy time, hence their difficulty in getting back from Paris in the first film.

Marv and Harry get away with clothes theft at the rink, scaring Kevin in-front of Duncan's Toy Chest (plus the chase afterwards) and grabbing a few of the children on the field trip in Central Park with no comeuppance, despite witnesses.

Immediately following the scene with the pigeon lady in the concert hall attic, Kevin walks toward the railing and a boom mic is visible as a reflection in the window to the left of the screen.

At the Plaza Hotel, Kevin asks the manager where the lobby is. He says down the hall and to the left, but Kevin turns right and arrives at the lobby.

When Kevin records the phony message of his father booking a reservation at the Plaza Hotel, he doesn't give the check-in and checkout dates, nor does the reservation clerk ask.

(possibly intentional) Harry tells Kevin to throw down his camera and they'll leave him alone. But Kevin's camera is a Polaroid that prints out the pictures as they're taken, so he could throw down the camera, but he'd still have the incriminating photos.

The flight attendant on Kevin's flight as well as the announcer at O'Hare Airport announce Kevin's flight as simply going to "New York" with no specifics of which airport it is. Since New York has two airports, LaGuardia and JFK (three if you count Newark Liberty), a professional airline employee would make sure to announce the correct airport, especially in a multi-airport metro area like New York.

At the start when the newspaper blows to Kevin's house, it shows the news of Marv and Harry's escape along with their mugshots, presumably after their arrest in the original as they are shown with their injuries. However, Harry is shown with a intact beanie. The top half was burnt off when his head was scalded from the blowtorch.