According to legend, the running gag of calling Camp Northstar director Morty by the name of Mickey instead is an arcane reference to Mickey Mouse's original name, Mortimer Mouse.
According to one of the featurettes on the DVD, several of the shots in the movie were added after initial filming ended. These included the scenes of Rudy and Tripper at the bus station and of them playing blackjack for peanuts. During the time off, Chris Makepeace had entered puberty and had the beginnings of a mustache. Bill Murray decided that it had to go so he took Makepeace over to a sink, lathered him up with soap and shaved off his mustache. So Makepeace received his first ever shave from Murray.
When talking to the news crew, Tripper introduces himself as Camp Mohawk program director Jerry Aldini. Jerry Aldini was the name of Bill Murray's lounge singer character on Saturday Night Live (1975).
First starring role of actor-comedian Bill Murray. Murray had sole name above the title billing on movie posters.
The red shorts and colorful Hawaiian shirt that Bill Murray is seen wearing in the movie were his own clothes.