Continuity mistake: When Greg and Pam are dancing in the restaurant, just before De Niro picks up the message from the neighbour about the cat, when the shot is on Greg's face their heads are together, but when the shot is on Pam's face, their heads are separated. This is shown like 8 times, 4 times each side.
Continuity mistake: In a few scenes of Pam's bedroom, if you were standing at the foot of her bed and look to the right you would notice that there isn't a night stand nor a lamp sitting on it. So how is it that Greg happens to turn on a lamp that is sitting on a night stand when he proposes to her?
Continuity mistake: In the 'race scene' near the end of the film, just before Greg and Jack go their separate ways, you see Larry (who is sitting next to Greg) say, 'Oh, look, there's Jack. Hey, Jackie,' and he waves. Then it cuts to Jack, who is looking at Greg, and then it goes back to Greg, and in the background you see Larry and he is unfolding a newspaper and starts reading it. Then it goes back to Jack, and then back to Greg, where you see Larry with his hands on the dashboard, looking at Jack. So what was with the newspaper? Where did it come from? How did it disappear so quickly?
Continuity mistake: When Pam goes into the den to console Greg after firing the 'shot heard round the world,' she puts her arms around his neck. In alternating shots, her hands go from under the hood of his sweatshirt to on top of the hood.