Fred Jones mistakenly says "Tom" as the first name of Tim Sevine, but the latter is correct, as seen in the short How to Make a Monster. There's already a Tom Burden, and it would be odd to have two Toms in the same story.
Tom Burden the director and Tim Sevine the makeup artist are recurring characters of John Rozum that he has used in several other stories, but he says "they didn't always look the same."
Even for classic episodes of Scooby-doo, the first mystery by Chris Duffy is too obvious, and the running gag of sleeping Velma gets old really fast. The second mystery however prints with a red herring and an unexpected solution hinted at during the beginning. Joe Staton of course does a smashing storyboard.