Trivia: The scene when Ramona delivers the package to Scott and he signs for it, he takes the package and throws it over his shoulder into the trash can, some several feet behind him. In the outtakes reel, they show that no special effects were used. Michael Cera made the shot over his shoulder on his 33rd attempt.
Trivia: Some of the crew members and background extras were also a part of the film "Repo: The Genetic Opera", which has a similar premise. Story goes that Universal wanted to make "Repo", but backed out after the producers refused to meet their demands. (Universal execs reportedly wanted to remove all the musical numbers from "Repo", even though it was by very design a rock-opera.) After leaving the project, Universal then announced this film (then titled "Repossession Mambo") and reportedly approached cast and crew members from "Repo" to come over and work on this film. The creators of "Repo" have made it clear that they feel Universal was merely trying to spite their production by poaching cast and crew members who were unaware of the falling-out between "Repo" and Universal execs.
Trivia: When the goalie is scared away by Billy Crystal during the end credits, he yells the Wilhelm scream.
Trivia: Of all people, famed director Christopher Nolan (The Dark Knight Trilogy, Inception, etc.) is reportedly a huge fan of the character and this film, and would constantly quote jokes from it on the set of "The Dark Knight Rises." He almost attended the cast table-read for the 2021 sequel series on streaming service Peacock, but was unable to. He sent the director an e-mail to read before the table reading, jokingly saying that the world was "watching" and "waiting" for more MacGruber.