These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ethnic Scrappy: Flim-Flam is a subversion. He was a Token Minority, but didn't behave in a stereotypical way, but this didn't make him less annoying.
Fridge Brilliance: In the last episode when Simbooroo opens the chest three random ghosts come out not from earlier in the series, which is more than likely a cost cutting measure, but earlier in the episode in a throwaway line Vincent mentions they are trailing a ghost that keeps alluding them, and we see in the episode his chief plan is to send other ghosts/zombies after the gang, meaning they were probably his minions they captured prior to the episode.
Rescued from the Scrappy Heap: To his haters Scrappy was considerably better received in this series. Then again, that might've had to do with Flim Flam being viewed as worse by those fans.
The Scrappy: Flim-Flam is even more of a Scrappy than the trope namer. Most of the show's hate goes to him instead of Scrappy Doo.
Ship Tease: Probably the best of the originals to find it in:
Daphne is practically wrapping her arm around Shaggy in the opening
In To All the Ghouls I Loved Before, Shaggy and Daphne share a long embrace after Daphne is returned to normal. Scooby looks on happily.
In Reflections in a Ghoulish Eye Daphne leans on Shaggy to catch her breath after running, the only two characters making contact in that scene
In That's Monstertainment, the Scooby gang is all living in the same house.
In Scooby in Kwackyland, Shaggy has his arm around Daphne on the raft as Platypus Duck takes the gang up the river.
In The Ghouliest Show on Earth, look when Shaggy runs off with Daphne, Mumsie and Dada Doo. His hands look very close to if not on Daphne's rear.