Continuity mistake: In the kitchen scene, when Frank's parents are arguing, the clock reads about 6:45 and then in the next shot, it is 6:15.
Continuity mistake: At the dinner table, after catching Nick Stahl and Morisa Tomei upstairs, Tom Wilkinson prepares a meal for the 3 of them. Marisa is seen putting food in her mouth, but when the next shot cuts to the front of her, she's now having a drink.
Factual error: In a short scene, Sissy Spacek is seen walking down the sidewalk with a 16 ounce cardboard cup of coffee with a cardboard cup holder. The film is set in the mid 1980s, well before regular people walked around with coffee shop coffee in a cardboard cup.
Factual error: There is giant Altoids display at the grocery store counter in the scene where Sissy Spacek sees William Mapother. The film is set in the mid 1980s - Altoids' massive marketing campaigns are a more recent event.