Trivia / Scooby-Doo: Monsters Unleashed

• Acting for Two:
  • Dee Bradley Baker voiced the Pterodactyl, the Zombie and the Red-Eyed Skeleton ghosts.
  • Michael Sorich played the Tar Monster and the Cotton Candy Glob.
  • In the Brazilian dub, Mauro Ramos voices both Jacobo and the Black Knight.
• Bonus Material: There are featurettes and games on the DVD.
• Creator's Favorite: James Gunn revealed that Captain Cutler is his favorite monster.
• Cowboy BeBop at His Computer: In the Nostalgia Critic's review of this film, he calls the Miner 49er a Ghost Pirate and mistakes the Tar Monster for an Oil Monster (although Tar is derived from Oil). He also thinks freezing the Tar is unrealistic, calling it a Jump the Shark moment, even though it is possible.
• Deleted Scene:
  • Scooby and Shaggy look inside Old Man Wickles' manor.
  • The Black Knight Ghost and the 10,000 Volt Ghost steal the rest of the costumes at the museum.
  • One of the Skeleton Men tries to reattach himself down the mountain, but fell off.
  • Shaggy gives Scooby his last Scooby Snack.
  • Velma talks to the Skeleton Men after she attacked them.
• Edited for Syndication: The post-credits scene where Scooby-Doo advertises a secret code for the Game Boy Advance version of the Scooby-Doo 2 game was cut from HBO Max's print of the film, likely due to the system having been long discontinued by the time it popped up on the service.
• Franchise Killer: This made considerably less money than expected (but still profited) and its harsh critical reception led to a third film directed and written by James Gunn being cancelled. The next live action adaptations were two Made For TV Movies with different cast members (Scooby-Doo! The Mystery Begins and Scooby-Doo! Curse of the Lake Monster) as well as a Direct to Video film featuring Daphne and Velma (Daphne & Velma). The Scooby franchise wouldn't return to theaters until 2020... or, at least that was the plan, anyway.
• Kids' Meal Toy: Burger King had a set of five different toys, as well as a Mysterious Invisible Icee.
• Looping Lines: The Black Knight Ghost is performed on set by Kevin Durand, but voiced by Bob Papenbrook. The Evil Masked Figure is performed this way too, with Scott McNeil redubbing his own on set performance.
• Meaningful Release Date: The film was released on the thirty-fifth anniversary of Scooby-Doo, Where Are You!.
• Missing Trailer Scene: The teaser contains an extended version of Shaggy and Scooby's encounter with one of the Skeleton Men.
• No Stunt Double: All the actors did their own stunts, which pleased them all - in particular, Freddie Prinze Jr., who was very keen to do the motorcycle joust.
• Orphaned Reference: During a scene halfway through the film, the Tar Monster is wrecking havoc in downtown Coolsville all while the Evil Masked Figure demands the city to handover Mystery Inc, inexplicably riding on a Ghost Ship. Originally, the costume of Redbeard's Ghost was going to be among those brought to life, but the concept was scrapped sometime during production.
• Recycled Script: The movie did a very obvious lift of the Buffy the Vampire Slayer Season 2 episode "Halloween", including the main plot about monster costumes becoming real monsters, and the character development subplot of the character played by Sarah Michelle Gellar giving her nerdy best friend a makeover in hopes of attracting the guy she's crushing on, and instead attracting the character played by Seth Green.
• Those Two Actors: Seth Green had starred with Matthew Lillard in Without a Paddle and Sarah Michelle Gellar on Buffy the Vampire Slayer.
• Throw It In!: When Velma sits down and the Spy Catsuit makes a farting sound, Linda Cardellini ad-libbed "It was my outfit, I swear."
• Two Voices, One Character: The 10,000 Volt Ghost is voiced by both Dee Bradley Baker and Terrence Stone.
• What Could Have Been:
  • A gag was planned where Scooby would turn into Yao Ming when he mistakenly drinks a potion. In the final film, he turns into the Tasmanian Devil to make the film less dated.
  • Michael Rooker was originally meant to play Old Man Wickles.
  • The Skeleton Men originally had a green eye for the leader and a red eye for the minion. This was switched in the final cut. The original can be seen in the trailer.
  • Originally, many more costumes were going to be brought to life. These include The Creeper, Redbeard's Ghost, the Witch Doctor, the Ghost Clown, the Ozark Witch, the Giggling Green Ghost, the Wolfman, the Headless Horseman, and Chickenstein. Unfortunately, Warner Bros cut the film's budget, forcing the costumes to be reduced to background cameos, merchandising (mainly promotional trading cards), and behind the scenes footage. Most of them were able to be included in the tie-in GBA game.
    • Concept art shows the Ozark Witch, the Giggling Green Ghost, The Creeper and Redbeard's Ghost being among the monsters present for the Downtown scene.
    • Test footage for the animatronics and make-up effects were done during pre-production and actors were cast for most of them. The only ones that are known are Paul Becker, the movie's Choreographer who was cast as the Ghost Clown, and Christopher R. Sumpton, who was originally meant to play The Creeper before becoming the Zombie instead.
    • The Headless Horseman was originally meant to have a larger role in the film, with significant effort having gone to his animatronic head in addition to originally being Fred's opponent in the jousting scene. He ended up being replaced by the Black Knight, but it does explain why the Knight was suddenly riding a horse that wasn't a part of his exhibit.
  • The third film was supposed to be about Mystery Inc. visiting Scotland and learning that the monsters there are actually the victims.

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