Watching as Shaggy demonstrates actual investigative ability while trying to clear Owen Garrison's name. The fact that this is probably the first time Shaggy has ever spent time actually investigating a crime instead of eating, shows how much Mr. Garrison means to him; after all, Shaggy won't stop eating for just anybody.
Not to mention that Shaggy managed to find three highly probable suspects in Jennifer Severin, Brad Adams, and Hank Prince. Sure the rest of the gang was dead set on convicting Garrison and refused to listen, but still.
Owen Garrison donning his old Blue Falcon costume to help Scooby fight Hyde was pretty awesome.
Scooby himself seemed much more courageous than usual when facing the villain.
The title sequence features the Black Knight, the Miner 49er, the Space Kook, Redbeard's Ghost, the Ghost Clown from Scooby-Doo, Where Are You!, and Joker's and Penguin's Troll and Dryad costumed monsters chasing the gang before Scooby and friends are saved by Blue Falcon, Dynomutt, Space Ghost, Zandor, Mighty Mightor and Frankenstein Jr. It's practically a Hanna Barbera fantasy brought to life.
On a meta-level, Jeff Bennett does such a good Adam West impression that he might easily be mistaken for the genuine article.