Factual error: The opening scene outside the pre-school is supposed to take place in Chicago, but actually is somewhere in New York State you can tell by the postcard-like registration sticker in the lower driver side windshield of the cars.

Continuity: When Greg is at the airport's lost luggage department you see the baby chuck up on him but you can see it actually comes from too low down.

Continuity: In the first scene where Ben Stiller is holding the (substitute) cat the camera turns away from him for a second and it's in a completely different position.

Continuity: Pam's hair constantly looks different from shot to shot in different scenes. For example, when they first get to the parents' house it goes from limp/wavy to ringlet-type curls from shot to shot. Also, she is wearing a lot of eye make-up in the car on the way from the airport, but once she gets to the parents' house it seems like she hardly has any make-up on.

Continuity: For the first half of the movie, the cat's tail changes colour from black to light brown, to black again.

Continuity: Before and throughout the scene where Jack demonstrates his hidden cameras, the lemon and cherry in Greg's glass keep moving around.

Continuity: Robert De Niro's hairstyle changes throughout the film. At some points it's thin on top, at others it's rather thick.

Continuity: After the urn scene Greg and Pam are kissing and depending on where the camera is her hands are either on his cheek or more near his ears.

Continuity: Ben Stiller buys Champagne in a drug store, yet in NY the only legal place to buy wine/champagne is a liquor store.

Factual error: In the scene where Greg is getting acquainted with Pam's parents, Jack asks him what kind of car he's driving, and Greg tells him it's a Taurus. However, minutes before, as they drove in, you could see the back of the car and it was clearly a Ford Contour, not a Taurus.