Luke and Manny have a fight at school thus calling the parents to school on same day a Illinois vs Ohio State football game. College football games (especially those teams) played on Saturday. Therefore boys would not have been in school.
The Illinois/Ohio State game shown on the TV through the show isn't remotely close to the year of the episode. The first shot shown features Dustin Ward at quarterback. Ward played for Illinois from 2000-2003. Also, by the end of the episode, a shot is displayed of the screen where it's still only 12 minutes into the first quarter of the game; by context and time, it should at least be late in the game, if the game hadn't ended by that point.