** [[EverybodyLovesRaymond Robert Barone]], [[Film/IndependenceDay President Whitmore]], [[Creator/MontyPython and that funny British dude]]. Also in the first movie, [[spoiler:human Casper]] is portrayed by Devon Sawa, who would later portray [[FinalDestination Alex Browning.]]
** A then unknown [[LizzieMcGuire Hilary Duff]] playing Wendy in the third movie.
* MoneyDearBoy: The only explanation for the celebrity cameos. Or the long-term presence of Eric Idle.