Five different actors from the U.S. and U.K. versions of The Office appear in the film: Amy Adams, Ed Helms, Mindy Kaling, Craig Robinson, and Ricky Gervais. See more...
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Continuity: When Custer is explaining how they will yell "Attack!" before attacking and Sacajawea questions the veracity of this plan, she is first in front of the caveman, etc. (with her back to the door of the box-crate) and then with no one behind her (with her back to the side of the box-crate).
Continuity: The way crates are placed differs enormously between the moment before and after the dinosaur throws Ben Stiller flying. Watch the crates on the back: First they are spread apart, perpendicular to the animal, but when Stiller lands they're parallel and close together to hide the safety crash mat in between.