Revealing: When Jessica Alba's character is in the dentists room with the chipped tooth, its very obvious shes wearing a set of false teeth over her teeth.

Deliberate "mistake": In Antarctica when Charlie and Cam kiss, their tongues become froze together but this is impossible as it would take a freezing object for this to work.

Continuity: While Stu and Chuck are in the park playing frisbee, over Stu's right shoulder a woman carrying a soda sits down at a picnic table twice.