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Cupid in "Terrible Love" is Jerry Russo (meaning that this isn't the first time David DeLuise worked on a kids' show with supernatural elements in it).
Stuart (the nerd who ends up tricking Maggie into getting hit with Cupid's arrow played by Nick Purcha) would later go on to be Watch on Spooksville (another horror kids' series that airs on The Hub).
Tom Kenny is the title character on the episode "Uncle Howee" (and also voices the rabbit puppet, Loomis).
Charleotte McClainor Chyna Parks if you prefer played Sam on the episode "Argh V" (about a responsible girl whose free-wheeling parents buy an RV that belonged to a family that died in a crash and the RV is possessed by their spirits).
One of the main characters in "Dreamcatcher"note The one about girls at summer camp trying to stop a spider creature that feeds off nightmares is played by Michelle Creber (which any brony worth his salt would know is the voice of Apple Bloom on both My Little Pony: Friendship Is Magic and Equestria Girls).
Another My Little Pony: Friendship is Magic voice actress on an episode of The Haunting Hour: Alice's mother in "My Old House" voices Princess Celestia.
Gorgonzola (Will Shadley) plays Aaron in "Spaceman".
Jeff (the square-headed kid) is Sean (Sean Giambrone) in the season four premiere episode "I'm Not Martin". It's not hard to figure out (unless you've never seen Clarence), since Sean sounds like Jeff when he yells, "I'm not Martin!" (which is often in this episode).
Talking to Himself: As mentioned above, Tom Kenny not only plays Uncle Howee on the episode of the same name, but is also the voice of the rabbit puppet, Loomis, and they interact with each other throughout the episode.