Continuity mistake: When Harry and Marv are climbing down the rope, Marv goes first. There is a low shot looking up at them and you can see Harry's head look over the roof. The next shot is looking right at Marv as he starts to climb down. Harry has vanished.
Continuity mistake: When Kevin checked into the Plaza, the credit card was manually processed by the receptionist. However, the Concierge later runs the same card electronically and the screen flashes "stolen." The hotel wouldn't have both systems in place for credit cards. They would have had to call the credit card company to verify the status if they used a manual processing system.
Answer: I think they are just more shocked with how brazen Kevin is with telling off his uncle.
Phaneron ★