- Celebrity Voice Actor:
- Fifi is voiced by Kristin Chenoweth, who won a Tony Award for playing Sally in the 1999 Broadway revival of You're a Good Man, Charlie Brown.
- The Little Red-Haired Girl is voiced by Francesca Capaldi, best known to tweens for being on a show that knows a thing or two about anthropomorphic canines.
- Unlike the previous TV specials, which used the same archival sounds of the trombone for the adults, this film has some newer trombone speaking courtesy of celebrated New Orleans jazz musician Trombone Shorty.
- The Japanese dub of the film deserves a special mention: Unlike previous dubs of the franchise, when adult or teenage voice actors voiced the characters, child voice actors will voice all the child characters for the first time in Japan. The Little Red-Haired Girl is dubbed by Mana Ashida, whom many non-Japanese viewers can remember her as young Mako Mori. Sally is Erssime.
- Ditto in the Mexican Spanish dub, when almost all the child cast is voiced by actual kids.
- Executive Meddling: A case where this made the movie better: The Schulz estate had an eagle's eye over the movie's entire production, to make sure the film stayed true to Schulz's creation. Three of the film's executive producers were Sparky's grandchildren.
- Market-Based Title: Outside North America, many countries include Snoopy in the movie's title somewhere due to him being more well-known than the rest of the cast:
- In the UK and other parts of Europe, the title is Snoopy and Charlie Brown: A Peanuts Movie.
- In France, the title is Snoopy and the Peanuts: The Movie.
- In Japan, the title is I Love Snoopy: The Peanuts Movie.
- In Italy, the title is Snoopy and Friends: il film dei Peanuts.
- The title remained The Peanuts Movie when shown on North American premium cable broadcasts, but then became Snoopy: The Peanuts Movie on North American basic cable broadcasts.
- Real-Life Relative: Zoé Ivanna Mora, the Mexican Spanish voice actress for Lucy, is the daughter of the film's dubbing director, Moisés Iván Mora.
- Relationship Voice Actor: Japanese dub again: Charlie Brown's and The Little Red-Haired Girl's voice actors (Fuku Suzuki and Mana Ashida, respectively) worked together previously in a song titled Maru Maru Mori Mori!.
- Shout-Out: The Little Red-Haired Girl's family use a moving company called Mendelson and Melendez (as in Lee Mendelson and the late Bill Melendez, producers of the previous movies and TV productions).
- Stillborn Franchise: Since the film was a critical and commercial success, Fox has expressed interest in a sequel. Unfortunately, they only had the rights to make one film and the Schulz estate has not given the green light.
- Talking to Herself: Francesca Capaldi voices both The Little Red-Haired Girl and Frieda.
- What Could Have Been: There were plans for a live-action film in 1992 by writer John Hughes, but due to the critical failure of Dennis the Menace, the film was never made.
- Earlier drafts had Snoopy's siblings appearing in his World War I novel, filling a similar role to the bird mechanic crew.
Trivia / The Peanuts Movie