This episode reveals Ivan's middle name, Hadwinov.
As Timmy shows Ivan his pie in the face routine around the holidays, one of them shows Vicky giving Timmy a present which is a pie. A reference of the early transcript of "Fools Day Out".
Chester and A.J.'s voices in the recording footage of Groundhog Day was re-dubbed by Jason Mardsen and Gary LeRoi Gray.
SpongeBob SquarePants - Some elements in this episode are similar to the SpongeBob SquarePants episode "Fools in April".
When Ivan and the April Fool pull a cruel prank on his girlfriend, Chloe, which caused her to run off crying, Chester and A.J. give a stuffed groundhog as a gift, which then attacks Ivan, with A.J. coldly saying "April Fools, jerk." similar to how Squidward pulled a cruel prank on SpongeBob which caused him to run off crying and one of the Krusty Krab customers to call him out on the prank.
The Simpsons - Ivan arrives at school dressed as a doctor saying, "Hi, everybody!". A reference to the catchphrase of Dr. Nick Riviera from The Simpsons.