Maddie's "Corpse Revival" recipe is illustrated by a picture of the mortal remains of Michigan J. Frog.
Marcy's line "It's alive! It's alive!" is most likely a reference to Frankenstein (1931).
In the first segment, Toad to Redemption, while Anne is showing her potential plans to the mayor, the page with the third plan is briefly lifted up. On it is Trogdor from the web series, Homestar Runner.