Or probably deliberate. Scooby-Doo franchise does like its shout-outs.
"Is it weird that the most serious incarnations of these characters are the ones I have the most trouble taking seriously?" -Me, on the new HB Expanded Universe "That's how you know you're in the future-when 'Scooby' and 'Apocalypse' are next to eachother in the name sentance without a hint of irony or sarcasm." -Me, on Scooby Apocalypse