In the early trailers, the make your own omelet scene included the invention of the popcorn omelet. It grew into a ball then exploded sending kids flying out the windows. This scene was cut from the final film and removed from future trailers.
The postcard, sent by Dennis, which T.R. Polk finds pinned to the notice board at Chez Cheese, reads: "To all my friends at Chez Cheese, having a great time on my vacation. Hope our customers don't miss me too much. Looking forward to my next vacation!! Ciao mes amis, Dennis". The postal address on the card is "Chez Cheese, 1 Plaza Square, Pittsfield, PA. 91221".
When the twins are playing the video game, they argue about whether to launch their fighter jets from Milwaukee or Minneapolis, eventually they agree to Milwaukee. When the video game screen shows on screen, it's actually Duluth, MN.
Including a reference to "Star Trek IV: The Journey Home"(1986), and starring Christopher Lloyd from "Star Trek: The Search for Spock"(1984), "Camp Nowhere" also features actors Johnathan Frakes from series "Star Trek: The Next Generation" (1987) and future Trek actress Kate Mulgrew from series "Star Trek: Voyager" (1995).