Continuity mistake: When Allie takes a photo of the "perfect roomate", the roomate's pose in the photo doesn't match her pose and position at the time taken.
Audio problem: When Sam is trying to win back Allie's love, his mouth does not move while he's talking and rubbing her neck.
Continuity mistake: When Heddy leaves the shower nude after assaulting Graham, she wraps a towel around herself while talking to Allie. She walks into the bedroom with Allie following her in talking, and in the next interior bedroom shot, Heddy is instantaneously wearing a robe over a nightgown.
Revealing mistake: When Allie goes to vomit, the toilet moves like a prop. (01:18:00)
Suggested correction: Have you ever lived in a New York apartment? I've had toilets that weren't fastened to the bathroom floor at all and was still charged 900 dollars a month in rent. It's not outlandish to think the bowl might wobble a little if the superintendent has been lazy. That elevator in the basement is still broken, after all.
Continuity mistake: When Allie gets up from the bed to go down the hall to the answer machine she is totally nude. When she comes back and reaches around the corner for a towel she has underwear on.
Revealing mistake: After Allie writes the suicide note that Heddy dictates to her, Heddy fires her gun but it has the safety on it.
Revealing mistake: When Hedy, pretending to be Allie, tricks Sam by giving him oral sex, the camera shows where her head is when she is supposedly doing this - and her head is in line with approximately his ribcage. Unless Sam had some sort of medical anomaly, she was quite a bit off the mark, so to speak.
Continuity mistake: Towards the end of the movie, the knife blade mark on Allison's neck changes, disappears, and reappears.
