This episode is based on Mark Evanier's 1974 Scooby-Doo Where Are You! (issue #24) comic book story titled 'Mark of the Scarab' which featured the Jerry Sloane character and The Blue Scarab. Evanier (who also wrote the episode) recycled the story for this pilot episode adding Scrappy to the story. The Blue Scarab character - originally a hooded figure inspired by the Jack Kirby era of Marvel comics - was redesigned to resemble the DC Comics style superheroes that by 1979 had become very popular in television and film.
After Scrappy is left alone and tells the audience he's going to try and catch the villain with one of his 'Scrappy Traps', the scene cross fades momentarily to the later shot of the rest of the gang on the rooftop looking out for The Blue Scarab before abruptly cutting to the scene of the gang running towards the elevators. It is possible that this scene which leads to a gag with Scooby caught in the elevator with The Blue Scarab was added at a later point in production to fill time and was clumsily edited in.