The film was leaked online by an anonymous source on March 4th, 2023. This led to widespread speculation that Warner Bros. Discovery canceled the project for tax write-offs as they were known to do around this time, although the announcement of an official release puts the theory in question. Even then, the motivation behind the leak remains unknown.
The voice of the Hall of Justice's computer is made to sound like Ted Knight who was narrator of the original Super Friends (1973)
When Scooby and the gang enter the trophy room of the Hall of Justice, they encounter a number of objects from DC comics, including the Helmet of Nabu, a 1940s-era Batmobile, playing cards representing the Royal Flush Gang, Starro the Conqueror, a Manhunter, and power rings and batteries of the various Lantern Corps. Additionally, posters on the walls represent various eras of the Superfriends TV show.
When Shaggy and Scooby-Doo are going through outfits in the Justice League locker room they throw the costume of Black Vulcan on the floor. Black Vulcan is a superhero with lightning powers, similar to Black Lightning, that was created for Hanna Barbera's "Super Friends" show.
While monologing his diabolical plans to the Scooby gang, Lex Luthor quotes a line of dialog regarding real estate spoken by Lex Luthor from the 1978 Superman movie ( played by Gene Hackman ) in which he too was monologing his diabolical plans, but to Superman ( played by Christopher Reeve ) instead.