When the RV is parked out front there is someone in it wearing a red plaid shirt. In the following scene Doug and Carrie are in the kitchen and Arthur and Spence come up from the basement, none of whom are wearing red plaid.
At the very end the camper is seen from a distance. The camper shown is a fifth wheel that has to be pulled not self driven.
Arthur and Spence come up from the basement and. Arthur says he bought this canoe for the trip. They are carrying a kayak, not a canoe.
When Doug sees the guy in the RV at the traffic lights, the RV driver says he drove "down" from Seattle. This would make sense as it's filmed in LA, but as the shows title states, it's based on Queens NYC.