Continuity mistake: During the final basketball game, when Shep makes a finger roll for a layup, his jersey and 15 are backwards.
Other mistake: When the USA soccer world cup team is practicing in New York, on some field in Long Island, in several shots you can see the steeple for Union Avenue Christian Church, which is actually located in Saint Louis, Missouri.
Factual error: In the scene where St Matthews is Playing St Luke's in Football you can ADAMS printed on the chin strap of Matt Damon's Helmet. This movie was set back in the 40's or 50's and Adam's was not making those chin straps especially with ADAMS printed on the strap for many years to come.
Revealing mistake: In the scene when the coach's friend (priest) also played by Martin Lawrence is praying with the team. Every time it shows the back of the coach's head in line with the front of the priest's head it has noticeably less hair than Martin Lawrence and you can tell it is a stand in.
Revealing mistake: When Lex gets out of the shower after his last training session, you can see his black briefs when he towel dries himself.
Audio problem: Near the middle of the movie, in the scene when Van Damme's friend Joshua is taking Helene money, you see that the military police have set up a surveillance across the street. They show the policeman's point of view as he is looking through binoculars. You can hear Joshua spray breath freshener into his mouth. The window is closed and they are too far away to hear this on a busy street.
Factual error: During the Mike Webster autopsy, Dr Omalu asks Gracie for Mike's CT Scan of the brain again, but what she holds up is a MRI film, not CT. Then after interpreting the displayed MRI Dr. Omalu tells Gracie that this brain should be a mess, but it looks completely normal. Whereas the MRI shown by Gracie reveals several abnormalities like brain atrophy and degeneration due to complications of previous disease process. (00:27:45 - 00:28:30)
Character mistake: In the meeting in 1984 when Jason Bateman first appears they have players on the whiteboard in the background. They have "Hakeem Olajuwon." He didn't put the H back in his name until 1991. So it should have been "Akeem Olajuwon." (00:08:40)
Continuity mistake: When Manning first writes the word "assume" on the blackboard, it is written down towards the left center of the board. Then later in the scene, the word switches position to the upper left part of the board, then eventually back to the left center again.
Factual error: There are Velcro straps holding the pads on the blocking sled, and there is an end zone goal post with one base. Both of these items did not exist until the late 60s.
Other mistake: There's no way Harry could've smashed the cigarette vending machine at the gas station without somebody inside seeing him.
Factual error: The movie takes place during the year 1919. Yet before one of the World Series games the stadium announcer requests that everyone stand up to sing "the national anthem". The US did not have a national anthem until the 1930's when Frankin D. Rosevelt signed into law the Star Spangled Banner as the nation anthem.
Suggested correction: According to Ken Burn's "Baseball", Burns and Ward verify that "The Star Spangled Banner" was sung at a baseball game in 1918 to support the efforts of American Troops in WWI- in which players like Ty Cobb, George Sistler, and Christy Mathewson all fought.
The mistake is saying the announcer called it the national anthem, not that they sung "The Star Spangled Banner."
Factual error: The scenes set at Wrestlemania XXX (2014) were filmed at a RAW show in 2018 - fans are visible in the background wearing wrestling merchandise more recent than 2014.
Other mistake: In the 7th game of the season, a scoreboard shows the score with about 3:08 to go in the game as 43-12, but next the announcer says they lost 35 to 12.
Continuity mistake: When Katelyn puts on her hockey skates, her leggings are not on. When Ronnie returns the skate it is white. Her skates suddenly appear as neutral and her leggings suddenly appear.
Continuity mistake: When the doctor is telling Al her diagnosis, the pencil on the clipboard disappears and reappears as the camera angle changes between her and Al.
Factual error: The movie takes place during a single NFL season. In the beginning of the movie, when Brandon is still in Las Vegas, the paper he is using to pick games shows Seattle playing New Orleans. Later in the movie, still the regular season, Seattle and New Orleans are playing again. They would not play each other twice during the regular season.
Visible crew/equipment: After 'She's A Lady' takes a spill on the track, TJ runs toward her and when Billy grabs him and picks him up TJ's t-shirt and hoodie go up and the microphone/wire/gear attached to him are visible on his back. (00:30:45)
Continuity mistake: When Randy Quaid is trying to make the shot on the giant windmill, he swings and hits the ball. You can see the ball flies almost vertical and way to the right of the windmill. However the next shot shows it landing right on target.
Plot hole: Though there's supposed to be a championship football game taking place near the end of the movie, the stadium is strangely devoid of fans. A meager effort was made to fill some seats, but most of the shots show empty ones. It also looks as if the production crew tried to save money by using only half the stadium lights.