Deliberate mistake: When the boys are hunting in the forest, then they start to crawl after the rabbit, however, the background behind them is static as if they were crawling in place.
Moose
31st May 2006
South Park (1997)
19th Feb 2006
Futurama (1999)
Deliberate mistake: The fossilised dog looks like the dog did when he was young; it should look old and decrepit, as the dog was when he died. (Presumably deliberate, to avoid a spoiler.).
30th Jul 2005
Battle Royale II: Requiem (2003)
Deliberate mistake: The time taken by the countdown on the exploding collars varies wildly according to what is happening at the time.