The intial terrorist attack is a shot-for-shot parody of the Omaha Beach Landing scene in Saving Private Ryan, complete with Ronald McDonald looking for, finding and grabbing his own severed arm amidst the chaos.
The opening scene from this movie, a long shot of the camera pulling back over the mountains, is used in the second act. Also, the scene where cuddly characters are given swords and helmets is a parody of a scene before the battle at Helm's Deep.