The Blue Beetle comic book featured on the spin rack in the film's opening sequence in the comic book store is not a DC comic book, but was originally published by Charlton Comics.
The animation style and the opening theme song pays tribute to Spider-Man (1967), another insect-themed hero created by Steve Ditko.
Included as a DC Showcase short on the Blu-ray release of Batman: The Long Halloween, Part Two (2021).
The featured heroes in this product are all originally Charlton Comics characters. A comic publisher purchased by DC Comics in the 1980s.