Continuity mistake: In the last game against Gilroy, on the 16 yard pass to Tweeter, before Mox snaps the ball, you see the clock in the background counting down, 7:03, 7:02....etc. After the pass is completed, when Mox is coming to the line calling the next play, the clock in the background shows the clock at 6:55, 6:54...etc. Two pass plays later he hits Tweeter again for the touchdown and after all the celebrating, it shows the scoreboard with the time of 7:07 again. (01:33:02)
Continuity mistake: When Tweeder blocks the punt against Gilroy, it shows him running and putting his arms up in one shot. In the next he's in mid-air. (01:35:10)
Continuity mistake: In the whipped cream bikini scene, when Mox pulls back from kissing the cheerleader he has whipped cream on his shirt. In the next shot it's not there.
Factual error: Right after Lance gets hurt and Mox replaces him Mox's first play is a 40 yard pass for a first down after which everyone starts yelling he needs to stop the clock and the camera shows the clock moving. The problem is that in high school football the clock stops on first downs while they reset the chains so the clock should have stopped running until the first down markers were moved and the ref set the ball.
Continuity mistake: When Tweeder is puling up to Mox at the convenient store he has 3 girls in the car with him. if you look closely when he is driving down the street there is only a driver and no girls in the car.
Continuity mistake: In the last game during halftime the team rebels against coach Kilmer (Jon Voight) and leave. This leaves Lance to be the head coach, but what about the other coaches? They didn't leave with Kilmer - where did they go?
Continuity mistake: In the closing game, the score of the game is 17-7 but when Moxon is coming to the line, the score on the scoreboard is 14-7.
Continuity mistake: When Billy Bob is holding a camera when tweeter is about to hit the guy from the class of 1980, if you look towards the right, you see that Coke and Sprite cans are on opposite sides of the table. After the guy from the class of 1980 gets hit and the camera goes back to Billy Bob, you see that both of the cans are together and are on the other side of the table.
Continuity mistake: When Lance gets tackled and tears up his knee his shoulder pad is sticking out of his shirt at one point then it is back in then back out again.
Continuity mistake: In the seen where Mox runs the "oopty-oop" in practice, Coach Kilmer comes out and starts yelling at Mox. Kilmer grabs Mox's face mask. His hand moves from holding the top to holding the bottom and back to the top again.
Continuity mistake: In the practice where Mox runs the "oopdy oop" Tweeder is thrown a pass right before Mox takes the field. If you look closely he drops the pass as he is falling.
Factual error: In the game against Gilroy, Gilroy would be penalized quite a few times for their bench being on the field.
Plot hole: At the end of the game, they're trailing 17-14 with time for one more play from the 17 yard line. Unless the kicker was injured or something like that, every coach in every situation would kick a field goal in that spot to send the game to OT. Here, it wasn't even discussed.
Revealing mistake: In the game where Moxon has the 40-yard Scramble (against the Broncos) Tweeder seems to teleport around the field. He starts out on the far side (waving his hands), then has a block on the far side (as witnessed by the close yard marker), the scene cuts and he's on the near side of the field blocking (Moxon runs behind him), then he's on the far side (as Moxon gets up from diving Tweeder is behind him). Some fancy editing going on there.
Factual error: District Titles are mentioned numerous times, but when Coach Kilmer is leaving the locker room at halftime of the last game all of the banners say "Division Title" which is not an award in Texas HS football.
Continuity mistake: When Billy Bob is knocked out on the field and his team-mates crowd around him if you look closely someone has the #4 on,but that can't be because Mox hasn't arrived yet and never had his helmet on.
Continuity mistake: During the scene where Lance and Darcey are having sex on the drier, when Billy Bob comes in to throw up they show her in one scene with her top down and in the very next with her top up but she hasn't changed positions.
Continuity mistake: When Darcey reaches in the cabinet to get the Sundea glasses she clearly has on flip flops. After going into the kitchen to put on her "whipped cream outfit" she comes out and in the reflection of the gun case where Mox is looking, if you look down at her shoes as she is coming out, she has on tennis shoes - you see her laces from the shoes flopping around as she walks.
Factual error: In the final game for the district title, the opposing team would have had several penalties called on them for unsportsman like conduct for the breakdancing moves in the endzone, and all the other dancing the team did.
Continuity mistake: Toward the end, when Mox is about to lead the revolt against the coach, he completely loses his accent. Its especially noticeable when he is persuading one of the players not to take a painkilling injection.
Answer: There's no rule in any sport, at least none that I could find, that requires a team to have, or listen to, a coach. Obviously in most cases it's a good idea, but if the coach were poor and/or working against the interests of the team, the players wouldn't be breaking any rules by simply ignoring them and listening to someone else.