Visible crew/equipment: When Jack (De Niro) enters the airport door to keep Greg (Stiller) from leaving for home, you can see the reflection of the camera in the glass door and then it backs up as DeNiro walks in.

Meet the Parents (2000)
1 visible crew/equipment mistake - chronological order
Directed by: Jay Roach
Starring: Robert De Niro, Owen Wilson, Ben Stiller, Blythe Danner, Teri Polo
Revealing mistake: At the airport when Jack says 'tow it', there is an extra waiting for his mark to walk outside seen in the reflection of the doors.
Pam Byrnes: You never told me about your cat milking days in Motown.
Trivia: In the scene where Greg is entering the drug store, listen to the lyrics of the music playing on the speakers - they are very similar to his speech when he says grace in the dinner table scene. Obviously where he got his words from, but not immediately obvious unless you listen for it.
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Answer: Greg was probably surprised at just how "richy" they really are. Because lacrosse camp seems like a really rich, preppy thing to do. But mainly, I think he was suprised because he did not know that his girlfriend's ex and his girlfriend's sister's fiance knew each other. He didn't realize how connected they all were.