Revealing mistake: In the final game against Iceland scene, there is a point where you can see that the people in the stands are actually cardboard cut-outs.
Revealing mistake: When they take a snapshot and it spins, then lands on the USA Today front page, like "Bombay Leads Team USA!" and they have his picture there... the words underneath the pictures all of the times they do this never match the story. They are just random articles that are talking nothing about hockey.
Revealing mistake: During the penalty shot for Jesse Hall Number 9, notice he is right handed, as the camera changes.. the person doing the shot is shooting with a left stick, however when Jesse cheers, its back to right. (01:35:40)
Answer: There may be a number of reasons, but the most likely is that, if players work really well together, it makes sense to have them on the same line, regardless if they are both enforcers or not. To give an example, the 1990s Detroit Red Wings had the "Grind Line", which consisted of three forwards who were all known for their aggressive, physical style. The two wingers in particular were team enforcers. They meshed so well as a unit it wouldn't have been as effective to split them onto different lines, just to provide an enforcer to each. The combination of all three on one line worked very well, and other teams copied the format, though of course it was not unique to this team (see, for example, the Philadelphia Flyers' Legion of Doom).