Texan experimental post-rock band Explosions in the Sky scored the movie. The producer used small pieces of older songs by Explosions in the Sky as placeholders, but eventually grew so fond of the pieces that he licensed them along with the original score produced by the band.
The video clips used to show Dallas Carter playing the "Hays Rams" was actually a playoff game between the 02-03 Richardson Berkner Rams. One of the players captured from the Berkner highlights was Aqib Talib, who went on to become an All-American at Kansas and a first-round NFL Draft pick of the Tampa Bay Buccaneers.
The book displays several instances of racism and use of racial slurs to black players. When the makers of the movie asked Permian HighSchool to use all of their facilities for authenticity the school agreed only on the terms that all racism from the book not be included in the film to avoid a negative image on the school and town.
Live-action game sequences from the 2003 Permian High School football season are interspersed throughout the film. Director Peter Berg matched the uniforms and on-field jersey numbers for acted sequences so that the live clips would blend. Game sequences were shot on location at Ratliff Stadium in Odessa and the Astrodome in Houston.
There are only two title cards at the beginning of the movie. The first is "The following story is based on the 1988 West Texas football season." The second is the movie title. The cast and crew are not shown until the end of the movie.
The state trooper who pulls up next to Chavez and Billingsley outside of the 7-11 is driving a special police package Ford Mustang that was made from the early 1980s to 1993, and Texas DPS did indeed use these cars at the time.
Billy Bob Thornton and Lucas Black worked together on All The Pretty Horses (2000) 4 years earlier, taking place in Texas and Mexico as well. Which was directed by Billy Bob Thornton. Both films are based on books
In several scenes throughout the movie, players can be seen wearing Under Armour gear, shirts, elbow wraps, etc. Under Armour wasn't created until 1996, roughly eight years after the movie's depiction.
The trivia item below may give away important plot points.
In reality, the 1988 Permian High School Panthers lost to Dallas-Carter in the state semi-finals, not the state finals. Carter did go on to win the state championship, but was later forced to forfeit its entire season when it was discovered that an academically ineligible player had been allowed to play after his grades were changed.