Though the movie suggests that Christina was avoiding the ovary surgery, the real-life Christine had her one bad ovary removed a year prior to her suicide.
At 58:45, Tug talks about how Wadcutter bullets "explode on contact". Wadcutters don't explode as they have a flat or blunt nose.
When Christine covers the fire of the chain-smoking guy in the trailer he mentioned the smoke alarm had low batteries. Smoke alarms were not common in homes in 1974, but they were available.
At 6:05 George, the news anchor, describes an accident "on the 301". US 301 is, indeed, an important highway in Sarasota Florida, where the story is set. However, in the history of Florida, going back to Hernando DeSoto, no one has ever said "*THE* 301". That's an LA thing.
On the DVD, the closed captioning misidentifies "Annie's Song" as "You Fill Up My Senses".
At the end of the film, a character turns on "The Mary Tyler Moore Show" - the theme song is playing and the lyrics say "you might just make it after all". This movie takes place in 1974. MTM Show ran from 1970-1977 - by 1974 they would have been using the theme song that goes "you're gonna make it after all".
The Sony television in Christine and her mom's living room is a model clearly from no earlier than the late 1970s.
Christine's American accent changes from scene to scene.