The regular season
In the film, the team was depicted as practicing in full pads and with full contact on the first day of practice. Under rules of the University Interscholastic League (UIL), the governing body for Texas public school sports, teams cannot use pads or hit until the fourth day of practice (however, in the deleted scenes included in the DVD, a non-pad practice was shown).
A Permian booster was heard toasting Coach Gaines' second season as Permian's head coach. It was actually his third season as head coach.
Boobie Miles, in the book, injured his knee by getting his foot caught on the AstroTurf during a pre-season scrimmage against Amarillo Palo Duro High School at Jones Stadium in Lubbock. In the film, he was tackled by two players at the knee and suffered his career ending injury in the final minutes of a blowout season opening game at Ratliff Stadium against Marshall High School.
In the film, the top-ranked Permian Panthers defeated the hapless Marshall Bulldogs in a non-district game. In real life, the third-ranked Marshall Mavericks (whose colors are red and white, not purple and gold) defeated fourth-ranked Permian 13–12. In the film, the game was the season opener and played on a Friday night in Odessa. In real life, it was Permian's second game of the season and played at Maverick Stadium in Marshall on a Saturday afternoon. Permian's football team chartered a jet for the 500+ mile trip from Odessa to Marshall, spawning controversy on the cost of the trip. Played before a crowd of more than 12,000 fans at Maverick Stadium, the game was on a searing September afternoon when the temperature topped 100 degrees Fahrenheit (38 °C). The footage shown in the film was from a game against the Midland High Bulldogs, who weren't mentioned in the film. Permian defeated the Dawgs 42–0 in district play, but the two teams ended up in a three-way tie along with Midland Lee for the district title.
In the film, district play began in week 2. In the real regular season, district play began in week 4.
In the film, Permian defeated "North Shore Galena" in a mid-season (presumably district) game. In reality, North Shore High School was within the Galena Park Independent School District located in the Houston suburbs over 500 miles (800 km) southeast of Odessa. Although North Shore and Permian have both been 5A football powerhouses, they have never played. Furthermore, North Shore did not start seeing football success until the mid-1990s.
In reality, the three teams tied for best district record were Permian, Midland Lee, and Midland High, all with 5-1 district records. In the film, Permian and Lee were joined not by Midland but by Abilene Cooper, and each team had two district losses. The tie-breaking coin flip was held at a truck stop outside of Midland, and Midland High lost (Cooper in the film), so Permian and Lee went on. Midland High's missing the playoffs was poignant as it had not been to the playoffs since 1951 and did not get back to post-season play until 2002.
A Permian player (Mike Winchell) was shown with coach Gaines at the coin toss. In reality, no players from any of the three schools were allowed at the coin toss. All of Permian's players were on the team bus returning from the game that evening at San Angelo Central. Permian assistant coach Mike Belew drove with Gaines from San Angelo to the site of the coin toss.
In a few scenes, players were shown wearing Under Armour apparel and facemask shields, although in 1988, Under Armour and visors hadn't been invented yet. (Under Armour founder Kevin Plank was in high school in 1988.) The book says they wore green visors, which are now outlawed for high school and college teams.
In the film, the quarterback for Midland Lee was shown wearing a Riddell Revolution-style football helmet. The brand, Riddell, had been around since 1929, but the design didn't appear until 2002.
In the film, the annual duel against Permian's archrival Midland Lee was portrayed as Lee having a handy lead throughout the game, with Permian never having a shot at victory. In real life, Lee had to come from behind with a late-game touchdown to win the game 22–21.