At the end of the first game with seconds left, the team with the ball gives it to the running back, and Bateman strips him of the ball. In all Professional Football games the QB would simply take a knee to end the game with so little time left, and would never hand it off to the running back.
Just after Falco kisses Annabelle for the first time, you see Falco score a touchdown. He's hit by two defensive players as he rolls into the endzone for the score. Next, John Madden describes the replay. When Falco's touchdown is replayed on the Madden-vision, he's hit by one defensive player and rolls into the endzone differently.
During the final game, after the "Kick ass" play, the referee has difficulty calculating the number of penalty yards the Sentinels have earned. It then goes to a shot of Falco laughing at the ref; behind Falco you can see the same ref, standing motionless, while you can continue to hear him calling the penalty.
In the first game against Detroit, Washington takes a touchback on the opening kickoff, which would start them at the 20 yard line. Before they get a play off, they are penalized 2 "delay of game" penalties, which would've put the ball on the 10 yard line. However, when getting ready to snap the ball for the first time, the ball is clearly placed at the 8 yard line.
During the first game, Falco gets hit in the head by one of his own teammates and goes to the ground. The camera shows Falco lying on his side in the middle of the field looking over towards the sideline, and you can clearly see the coach's khaki pants as Falco is getting up. The very next frame shows the coach on the sideline yelling over to Falco.
In the Dallas game, on the next-to-last play (the one called back for holding), Falco reaches the goal line and the end-zone is green with no paint. Then he gets hit by #56 and then spins into an end-zone with "Washington" painted in it.
During the "fight play" on Shane's first play in the final game, the referee (in the white hat) is broadcasting the penalties over the PA system. In the close-up of Shane smiling, the referee is behind him in the backfield area, where he is always stationed during a play.
On the last play of the Dallas (final) game, when Brian catches the winning touchdown, he catches the ball inside the end-zone, falls to the ground, and slides out the back of end-zone When he makes the catch and lands, the end-zone is green with no paint on it, and he slides into the solid white painted area behind the end-zone (you see the pylon meaning he has gone out-of-bounds after securing the catch). The next shot (from further away) he is in the middle of the end-zone, in-bounds, and the end-zone is painted with letters (he is to the left of the 'S' in 'Washington'.
During the San Diego game when the Sentinel cheerleaders start to do their naughty cheer you can see the San Diego QB (#12) on the sidelines ogling the girls with his helmet off. In the very next shot he is taking the snap.
When Falco comes out of the tunnel prior to the start of the second half in the Dallas game, Coach McGinty looks up at the replay screen and seems surprised to see Falco in uniform. Since Coach McGinty had just told Falco to "suit up" in the locker room a few minutes before, he would have expected Falco to come out for the second half.
When McGinty is telling Falco that Martell has crossed, the head-on shot of Falco absorbing this news shows him looking to his left, when the camera angle changes to show him from behind, he is looking to his right.
Just before "I will survive" in The Endzone bar, the camera pans across a highway in DC - but the shot is played in reverse. As it pans left, all the cars can be seen moving backwards down the highway.
During the Sentinels' first game, the first two Sentinels kickoff receptions, both from the initial kickoff and after the first quick Detroit touchdown, appear to use the same video, but from different angles. In each instance, #48 catches the ball just inside the end zone and bobbles it in the same fashion.
In the scene where McGruff kicks the 65 yard field goal ("Put me in boss-I'm bored", and "smoking on the field") we see all or part of the same clip of McGruff smoking four times. The clip involves him taking the cigarette out of his mouth, and blowing a cloud of smoke. (We see it first over the tail end of John Madden's voice-over. Then, the loan sharks (watching on TV) see it again. Then, we see a small section from the end of the same clip ("live"), and finally, we see an almost complete replay of the same clip. Finally after that, McGruff flicks the cigarette butt away, and play continues.)
During Falco's first play in the Dallas game (kick ass on one), the ref calls multiple unnecessary roughness calls and then wonders how many penalty yards to give. In Pro football, only one penalty may be called per team per play, so it wouldn't matter how many people got caught, only one unnecessary roughness penalty would be called, for 15 yards.
During a kickoff sequence the announcers become excited that the receiving team must get out of bounds to stop the clock. This is not true. The clock will stop automatically after any kick or change of possession.
In the last game against Dallas, in the drive leading to Washington's second touchdown, on the next to last play there are two defensive players (Bateman and "Smith" Wilkinson) in the offensive huddle. With the earlier injury, it is conceivable that one defensive player would be asked to play "both ways" - but not two.
Towards the end of the second game when the team is attempting an onside kick, Shane Falco is on the field and actually tackles Danny Batemen to prevent the clock from expiring. Quarterbacks generally do not participate in kick-offs, onside or regular. They are usually resting and preparing for the next offensive series. During the play John Madden says "They have to recover the kick and then call timeout". In the NFL the clock automatically stops after all kickoffs, so no timeout would be needed to stop the clock.
While it was the Player's Union that went on strike and the cheerleaders are not part of the union, they would not need to be re-hired. However, the cheerleaders refused to cross the picket line except for a handful, thus requiring Annabelle to have try-outs.
Towards the beginning, when Falco first arrives at practice, he does a practice throw. Player #34 starts running to catch the ball, but the ball goes to #81 instead. Both players can be seen starting to run; he may have intentionally gone for the deeper player.
When the players went on strike, they said there were four games left, which would make it November/December. In Washington, the weather would be autumn/winter, yet the exterior shots, short sleeve casual shorts, shorts etc, would indicate much warmer summer/early fall weather.
In several shots of the game clock, it is frozen, even during sequences when it should be running. In fact, it is obvious that every shot of the game clock is of a painted tarp, and that the clock is incapable of running.
During the bar fight scene, as Martel tackles Falco, sparring mat's are clearly visible on the floor and as a player is being dragged down the bar, he cuts his hands through broken glass, but no blood is present.
In the Washington vs. Phoenix game, after Clifford Franklin catches the "stick-em" touchdown, the scene changes to an overhead shot of the endzone where you can clearly see REDSKINS and the Redskins logo on the field under the PHOENIX paint in the endzone; suggesting the scene was filmed in Landover, MD and not Phoenix, AZ.