Continuity mistake: Ben Affleck has a large tattoo on his right shoulder/bicep that has been covered up by make-up for the movie. During the 'waterpark' scene Ben is wearing a T-shirt and when he scoops the little boy out of the water and lifts him into the air the sleeve of his shirt pulls back a little and you can clearly see the bottom of his armband tattoo.
Continuity mistake: Abby's hair colour changes between two different shades throughout the film, one much darker than the other. The most noticeable instance: In the scene where she and Ben's character make love for the first time, it changes from light to dark between his living room and the bedroom.
Continuity mistake: When Abby is about to make her "big realty deal" she has her hair in a pony tail with a piece of hair wrapped around where the rubber band would be. At first her hair is sticking up, pretty noticeably, then a couple seconds later, it's perfect and not sticking up, then sticking up again.
Continuity mistake: After a big realty deal, Abby and Buddy are eating sandwiches. Buddy takes a bite out of the right side of his sandwich. When the scene goes back to Abby, the bite is out of left side.
Continuity mistake: In one scene Abby is wearing a white collared blouse with a tan collared jacket over it. The blouse collar keeps moving from the outside of the jacket to the inside of the jacket throughout the whole scene.
Continuity mistake: In the movie she says that her husband has been dead for more than a year, but when the woman shows up with the tape, it reads Dec. 17, 1999.