During the climactic game with Chicago, the announcers mention several times it is a Championship Game and if Dallas loses, their season is over. However, at the end of the movie (a day or so after the game) when Elliott is talking to Maxwell and tells him he has quit the team, he tells Maxwell, "Good luck on Sunday."
During the game with Chicago, the stands in the stadium are empty.
When Alcie Weeks injures his left hamstring, he hops on his left leg, putting all of his weight on the leg that is injured. If his left hamstring were pulled, he would have been hopping on his right leg.
There are several lip-synch problems throughout, probably due to re-dubbing lines.
When Phil is walking into Conrad Hunter's office building which is supposedly in Dallas, the Westin Bonaventure Hotel is plainly visible. This hotel is in Los Angeles and is an iconic building of five glass cylindrical towers.
When Elliot walks over to Balford at the party when he's punching the table, he calls him Eddy.