Continuity mistake: When the butterfly clips are put onto Tommy's head after the fight, the amount of blood on them through the following scenes that night and the next day varies from bloody, to clean, to bloody again, over and over again.
Continuity mistake: During the sequence where they are painting the kitchen, a bunch of paint gets spilled on a guy who is mad about it. When Natalie Portman leaves to get him clothes, he stands there with paint on his shirt that is solid. The scene changes and there is now a smear on his shirt in the paint. The scene changes again, and the smear is gone, back to what it was before.
Continuity mistake: After Grace kisses Tommy she is in bed wearing the necklace with the ring, then she holds the letter and lies down again but the necklace is gone.
