Continuity mistake: When Simon goes into Ruthie's room to talk with her, she is colouring in a Hello Kitty colouring book. As the camera switches between her and Simon, the picture she was colouring is alternately finished, then not finished, then partially coloured over the series of the entire scene. (00:36:45)
Other mistake: Lucy's drivers license says her birthday is in January but she was conceived on Valentine's Day.