Continuity mistake: When Wally is talking to Sebastian in his bed, the latter has lost two of his bottom teeth. For most of the rest of the movie they are there. In the last scene they are gone again.
Factual error: Just after the scene from "the picture frame store" with Jason Bateman and Jeff Goldbloom, there are a few shots of New York City. One of the shots features the twin towers of the old World Trade Center. (01:08:30)
Continuity mistake: When Wally tells Sebastian that he'll go to his birthday party, Sebastian's hair is alternately messy and sticking up or not.
Continuity mistake: In the last scene, Sebatian's birthday party, in the kitchen neither parent is wearing a wedding ring, but in the next scene when they are singing happy birthday, they both have wedding rings on.
Continuity mistake: Just after Kassie tucks Sebastian into bed, Kassie sits on the couch with Wally while he's looking at old photos. She then holds up one of the photos in her left hand while she holds a glass of wine in her right hand, but in the side shot the items have suddenly switched hands.
Continuity mistake: In the scene where Kassie is waiting outside Wally's work building, there is a shot of Kassie with some flowers in the background, the flowers are in the sun, the next shot is of Wally then back to Kassie, the flowers in the background are now in the shadow of a building.
