The animated debut of Woodstock and Franklin.
The clown who takes Peppermint Patty and Charlie Brown's tickets at the Barrel O' Fun is a rare instance in the Peanuts franchise of an adult's face being visible.
The first "Peanuts" production without a musical score by Vince Guaraldi, who composed for all previous specials and the first and previous movie, A Boy Named Charlie Brown (1969). This was deliberate, as it was an experiment by Charles M. Schulz, who specifically wanted a more commercial, Disney-like feel for this film.
This was the first "Peanuts" production (as well as the only "Peanuts" theatrical feature until The Peanuts Movie (2015)) to not have the words "Charlie Brown" in the title.
While later hailed as a classic, this movie was a box-office failure in its original release. Produced on a budget of $1,000,000, it only grossed $245,073 at the box office. This was because Cinema Center Films was being shut down by CBS by this time, and thus the film had anemic marketing. As a result, this film was the final release of Cinema Center Films.