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.
The first of the theatrical Peanuts films with Peppermint Patty as a major character. She previously made a very brief cameo in one shot of A Boy Named Charlie Brown (1969).
The plot of the film is an expansion of a storyline previously featured in the Peanuts comics strips.