Trivia: Riley is the only character in the movie with both male and female emotions.
Trivia: John Ratzenberger is Earl, an antagonistic velociraptor who is a member of Bubba's gang who tries to eat Spot. John has voiced parts in all Pixar films.
Trivia: Most of the names on the check-out card in the book are actual fictional characters or real people, most being pirates. There's Davey Jones, Bluebeard, Blackbeard, Captain Kidd, and Frank Beard. Frank Beard is a member of ZZ Top and incidentally the only member without a beard. (00:03:35)
Trivia: The hair style Dracula gives Dennis is similar to Al Lewis' hair style when he played Count Dracula on "The Munsters."
Trivia: Nick Park, the film's executive producer, has a cameo as the man photographing the birds at the pond.
Trivia: This was the first "Peanuts" film since the death of its creator, Charles M. Schulz, in 2000.
Trivia: Futurama's "Anthology of Interest II" episode contained a segment called "Raiders of the Lost Arcade" where Fry asks what would happen if life was more like a video game. In the segment, video games come to life and attack Earth, and it's up to Fry to save the day because of his video game playing skills. Billy West, who voices Fry, later performed voices in "Pixels", which was based on this premise.
Trivia: The version of Batman in the universe of this movie is called Kirk Langstrom. In the original DC universe, Kirk Langstrom is actually the alter ego of one of Batman's villains, known as the Man-Bat.
Trivia: Apart from the two leads, Tom Noonan voices every character (male or female) in the film.