Plot hole: The fake Jinx wouldn't be able to get into the den, the door was closed.

Meet the Parents (2000)
1 plot hole - chronological order
Directed by: Jay Roach
Starring: Robert De Niro, Owen Wilson, Ben Stiller, Blythe Danner, Teri Polo
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.
Jack Byrnes: What are you driving there? Ford?
Greg Focker: Yeah it's a Taurus. Yeah, we were going to get a mid-size, but I figure, hey, we pull down decent bucks. Might as well go all out, and pop for the full-size.
Jack Byrnes: Sure. Interesting color. You pick it?
Greg Focker: Oh, no, the guy at the counter. Why?
Jack Byrnes: Well, they say geniuses pick green. But you didn't pick it.
Trivia: Originally, the film was meant to be a vehicle for Jim Carrey. Among his contributions was Greg's surname, "Focker." Eventually, Carrey left the production, and Ben Stiller took the part.
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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.