Continuity mistake: In the beginning when the guy pours the beer in the vase, the foam is filling half the cup but when the scene changes it is about an inch on the top of the glass. The camera cut for only one second, which is not enough time for the foam to rise.
Continuity mistake: When Fink is explaining the difficulty of the boot on the chalk board, he draws one circle on the toe of the drawing, it then changes to two after he throws Bo Bo and says "Sorry" and changes back to one circle again. You can tell that they are two different drawings altogether.
Continuity mistake: When Landfill tries to drink his way out of the tank, he drinks a lot of the beer to make the top fall, when the other guy comes in and finds him dead the top of the beer ends higher.
Continuity mistake: The beer that the guys make from the stolen recipe is a reddish-brown color. When the Wolfhouse brothers begin to bottle and sell the beer, the beer is in light green bottles. The beer inside the bottle is not reddish-brown, or else the bottles would have looked darker when full. The unopened bottles look like there's a light-colored beer inside of them.
Continuity mistake: When Jan wants to go double or nothing towards the end, just before he says "We're not that drunk" watch Todd in the back. His arms are crossed, but when the scene cuts they are down and he is closer to Jan.
Continuity mistake: When the real Von Wolfhoussen dumps the ashes on the two guys he got some on his clothes, but when the scene changes his clothes are clean.
Continuity mistake: After the Americans run out of the tunnel at the second Beerfest, they are followed by the Australians but you can see the Americans again behind them getting ready to come out of the tunnel in the back.
Continuity mistake: In the scene towards the end of the movie where the Americans are preparing to face the Germans in the all boot double or nothing challenge, when they are shot from the side there are 10 boots on the table. In the next shot when we see the American team face on, only the Americans' 5 boots are still on the table. Then when they go back to the side view in the next shot all 10 boots are back on the table.