* DawsonCasting: The 28-year old Jay Baruchel as the 20-year old Dave.
* FakeAmerican: Becky is played by an Australian.
* HeyItsThatGuy: Hey, [[Film/GhostRider Ghost Rider]] is fighting [[Film/SpiderMan2 Doc Ock]] to prevent him from releasing the [[Film/StarTrekFirstContact Borg Queen]]!. Interestingly, Ghost Rider uses something akin to magic while Doc Ock uses science... this movie manages to connect them both.
** [[Film/TropicThunder Kevin Sandusky]] loves [[Film/IAmNumberFour Number Six]]
** Is that [[DeadMansShoes Anthony]] as the not so evil henchman, I see?
** Becky apparently looked like [[Series/{{Jessie}} Emma]] as a kid.
** [[RockNRolla Being a real rock n' rolla]] means being a big famous illusionist?
* HeyItsThatVoice: Hey, it's [[Film/HowToTrainYourDragon Hiccup]]. [[RetroactiveRecognition The trope is inverted this time.]]
* WhatCouldHaveBeen: An earlier draft included an appearance by Chernabog himself in the climactic battle, though he'll be in the sequel if they get the chance.