Max: Who him?
(Norman gets cramped in a door)
Max: If seven dwarfs come by, I'll tell them the door is blocked.
Scientist: No! Corpus is mine!
Max: What? Is he falling apart?
Scientist: Yes, I guess you can say that.
Max: Why are we still running?
Norman: Good exercise.
Scientist: My name is...
Max: Mud, if you ask me.
Virgil's means of summoning: A game show contestant solves a puzzle that spells out Virgil's message in a Wheel of Fortune like show that Max is watching on tv. The message was "Mighty Max, go to 4th & Elm." A garbage truck is parked in the location of the portal.
Educational Epilogue: The value of friendship (supporting someone you care about who is in trouble).
Corpus was a monster from the Horror Heads line of the Mighty Max toys, but was drastically changed to be less grotesque and scary.
Virgil sends Max a message via a puzzle on a game show called Wheel of Fortune, which was created by Merv Griffin.
The shapeless creature that absorbs people is clearly an homage to classic sci-fi monster The Blob, from the 1958 film of the same name.