Todd plays in the final game because the Germans claim he has not participated in any of the events, which breaks the rules of Beerfest. However, he is seen (poorly) playing Beer Pong against the English team shortly after the competition begins. One possibility is that every team member must participate in every round.
When Fink is trying to explain the boot on the chalkboard at their training area, he circles the toes of the boot continuously leaving a pronounced circle. When they cut back to him talking, it is now just a single perfect circle.
During the first of the two final American-German Das Boot competitions, the level of the beer in the boot is already below the bottom of the foot; there is no "bubble" to burst. In the next shot, the beer level is back up and the
When Team USA is playing Team England, USA wins their second game and in the background you can see the score keepers place a large 2 over the 1. In the very next shot, it shows a blank score board and the 2 being placed on it.
The beer made from the stolen recipe has the color of a pale ale or amber when being drunk the first time out of the keg by the guys. Yet, the same beer presumably served in the green bottles as "Schnitzengiggles" is clearly a golden lager.
Oktoberfest (naturally) takes place in October, and the team starts training in November. In the scene when the three-month mark is announced, the Schnitzengiggle Tavern is decorated with cupids and hearts, indicating that it is February, which would be eight months from October. Further, in the scene labeled the one-month mark, the tavern is decorated with garlands and colored lights, indicating that it is December, which would be a full ten months from October.
Team England wears the Union Jack as an emblem, which is the flag of the UK, not England. They are also referred to as "Britain" and "British." The error is underlined by the fact that there is also a Scotland Team, who would have equal claim to the Union Jack flag and the title "British."
In the scene where the brothers decide to create a drinking team, the month is already October when he flips a full year later to a fresh "October" page. On a real one-year calender, there would only be one page for October.
When USA and Germany are playing turbo quarters, if you look very closely you can see that the German on the end never actually picks up the quarters they just appear in his hand as he gets close to the stack revealing the use of CGI.