Wicked Jack is obviously a play on Jack O'Lantern.
In this film, the base where the monsters stay in looks completely different compared to what was shown in Monsters vs. Aliens (2009); they now live together in one huge room.
The Daughter refers to Link as "Kermit" from The Muppets Show (1976).
Link and Dr. Cockroach ride to the Murphy's home using a bike, with Dr. Cockroach wrapped in a blanket, resembling E.T. from E.T. the Extraterrestrial (1982).
The film takes place months after Monsters vs. Aliens (2009).