The characters of Matt and Brad are based on the two Michigan-born founders of the Canadian clothing company "Roots". In real life, they actually attended Camp Tamakwa, which is a real camp in Ontario's Algonquin park, which is where the film was shot.
Matt Craven plays one of the adults returning to summer camp, where they have such fond memories. Craven also played a CIT (counselor in training) in Meatballs (1979), another film about summer camp. Both films were shot in Canada.
There are a few scenes in which there are illustrations of Spider-Man. This is interesting considering that actor/director Sam Raimi went on to direct the ten years later Spider-Man (2002) and its two direct sequels, Spider-Man 2 (2004) and Spider-Man 3 (2007).
This movie and the later English film of the same name Alive and Kicking (1996) were made and released only about three years apart. During the early 1970s, when the reunion characters in this movie actually went to Camp Tamakwa in 1972, two other movies of the same "Indian Summer" title were also made and released about three years apart, in 1970 and 1973, they being Bablje ljeto (1970) ("Indian Summer") and Siromashko lyato (1973) ("Indian Summer").