When sitting on his Chinese Lantern, there is a rare chance that Gizmo will sing Frank Sinatra's "New York, New York". This is an homage to a scene towards the end of the film "Gremlins II: The New Batch", where the near-entirety of the film's Gremlins sing the same song as a big musical number with the Brain Gremlin leading the pack and providing the vocals.
One of Velma's moves in the game consisted of calling the police to take the opponent away. This was changed on September 8th, 2022 with the release of patch 1.02. With the release of this update Velma will now call the Mystery Inc. gang and the Mystery Machine instead.
NSFW - This trivia is considered "Not Safe for Work" - Click to Reveal
In the game's Beta, Tier 15 of the battle pass features the rewards of Pajama Finn and the feline character Cake, both from the animated series Adventure Time. This is a possible euphemistic reference to the "Tier 15 of Dating" joke from the series episode "Burning Low" implying in-game that Tier 15 is bestiality, although it's never actually stated what Tier 15 is in the episode.