Audio problem: When Focker is going back to Chicago the woman who is typing stops moving her hands for a little while the clicking noise is still going.
Audio problem: When Jack is talking to Greg inside the changing room, Jack is saying, "I'll be watching you", but his mouth is still moving saying something else. (00:51:40)
Audio problem: When Jack talks about Kevin's ring, Pam stops drinking and coughs slightly but her mouth doesn't move.
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.