When Scarlett goes over to Halley's house to discuss symptoms she is eating grapefruit. After complaining that Halley's 'perfume' smells she puts the plate of grapefruit to her right. But in the overhead shot of her and Halley we see that the grapefruit is still on the pillow in her lap.
When Halley is sitting with her grandmother on the bench in the backyard, the grandmother's right arm is around Halley's shoulder. The grandmother's hand jumps from 'cupping' her shoulder to hanging straight down in front of it to 'cupping' it again, depending on the shot.
When Halley and Ashley are at Len and Lorna's place, when Len first takes a glass of champagne, he is not wearing a wedding ring. In the next shot, Len is holding the glass of champagne, wearing a wedding ring.
Halley changes into a skirt before leaving for the Warsher's house, but when they're walking up to the door you can see her wearing pants from behind. Once inside, she's wearing a skirt again.
When Lydia is in the kitchen ranting about her ex-husband, she is chopping carrots. The shot cuts away then cuts back to show her chopping the top off a zucchini. But, when the scene cuts away and back again, she is chopping the carrots again.
When Halley and Scarlett are hiding behind the ticket booth at the movie theater, the reflection in the glass does not match the surrounding shots that show what they are looking at.
After Halley runs out on Macon at the New Year's party, she runs through the snow, as she goes, you can see her foot catch on the fake snow, pulling up one of the fluffy sheets.
When the family is on their way back from dinner at Ashley's future in-laws', Lydia agrees with what Ashley is saying, but in the screen change, her lips don't match to what she's saying.