Upside Mystery Legacy/Trivia


 * The first franchise by MGM Animation Studios to have four films.
 * The fourth sequel by MGM Animation Studios released in the 2020s after Swan Dream Pool: The Magic Trails, The Addams Family 2, and Dusk and Dawn: A Zodiacal Night.
 * The first MGM Animation Studios film to be released in July.
 * The twelfth MGM animated movie to be presented in 2.39:1 aspect ratio after The Forests Between Mountains, Drilling Pursuit, Swan Dream Pool, Saturn, The Mansion Warrior, Saint College, Sherlock Gnomes, Swan Dream Pool: The Magic Trails, Dusk and Dawn: A Zodiacal Night, Hailey, and Detective Carl Returns.
 * The only Upside Mystery installment to be presented in 2.39:1 aspect ratio, while the previous installments were presented in 1.85:1 aspect ratio.
 * Bill Hader and Kate McKinnon's third collaboration after The Angry Birds Movie and Finding Dory (both released in 2016).
 * The feature animation voice debut for Jenna Ortega.
 * The last acting credit for Olivia Newton-John following her death in August 2022. This will be dedicated to her memory alongside veteran MGM and United Artists Releasing president Erik Lomis, who died on March 22, 2023.
 * Upside Mystery is the sixth computer-animated franchise to have four main films, after Shrek, Ice Age, Puppet Pals, Toy Story, and Hotel Transylvania.
 * One of the four long-awaited animated sequels being released in 2023 along with Detective Carl Returns, Return of the Tiny Men, and Rickey the Wicked: Alaxesis.
 * It is rumored that the film's budget is around $200 milion, if these rumors come true, it'll surpass Upside Mystery 3 as MGM Animation's most expensive film.
 * Additionally it is one of the three animated films released by MGM in 2023 along with Detective Carl Returns and James Bond: Licence Renewed.
 * Gena Truman was clearly modeled after Wednesday Addams in Wednesday (2022), while Samantha "Sammy" Mintz was modeled after Tara Carpenter in Scream (2022) and Scream VI (2023).