Revealing mistake: When Ali is in the rain on the pay phone at the motel it is a modern phone, not from the era they were trying to portray.
Revealing mistake: In most of the scenes of the film, the famous filly is impersonated by a colt.
Revealing mistake: Dave is racing with the Italians, and the Italian puts his pump in Dave's spokes. In the middle of the bike falling over, you see a horizontal beige object with duct tape on it for a couple of frames, where you should see Dave.
Revealing mistake: In the scene where Brian Clough is at home you can see double glazed upvc windows, even though they were not around until the 1990s.
Revealing mistake: Throughout the racing shots of the movie, the close up shots of the fans in the stands show the same people used multiple times as evident by them wearing the same clothes, poses, etc.
Revealing mistake: In the closeups the boy is holding a large leaf of seaweed to offer the stallion. But in the long shots at the waterfront he extends an empty hand with no seaweed visible.
Revealing mistake: The time on the scoreboard clock when Ray hears the "go the distance" message changes from 10:30 to 10:32 in a matter of seconds.
Revealing mistake: In the beginning scene when the benchwarmers play the kids for the field, when Richie says to Clark "Clark used to get beef laid in his face all the time" he is holding a baseball, but you can see the baseball is soft as his hand deforms one side of the ball. (00:08:10)
Revealing mistake: When Lyon's brother is set on fire he's wearing fireproof gloves and hood.
Revealing mistake: During the last Race (the Agua Caliente), Phar Lap's hoof was re-opening from a crack earlier in the movie. When they show the close up of the leg/hoof during the race in slow motion, the "blood stain" keeps moving around on the leg wrap and hoof area.
Revealing mistake: The blue framed window the girls walk in front of after exiting the VW bus parked along the curb is presented as part of an extension of the house, but not when there's a front view of the entire house. The windows are actually aligned with the front door. (00:11:44 - 00:15:00)
Revealing mistake: When Capt Knauer aims the gun at Crewe after the game it shows the barrel with a plug and a hole too small for an actual bullet to come out of.
Revealing mistake: When Gus is reading "Sporting News" on the bus right before they meet Tanaka, the headline talks about the Buzz moving to third place. The article, however, is about a trade in the major leagues. (00:32:05)
Revealing mistake: In the fight against Apollo, Rocky's last punch of the second round conspicuously misses by a mile, but Apollo nonetheless acts like he has been punched, and there is a punch sound effect as well.
Revealing mistake: Establishing shots of the party where Chaney will fight Pettibon's guy; when we see the band play and people dance, the footage is rather obviously stopped and reversed to give the impression of a longer shot (evidently they had too little usable film of the crowd dancing). (00:31:00)
Revealing mistake: In the scene at the 1988 Monaco Grand Prix, the shot on board Senna's car is taken from qualifying, not the race. This can be shown in the shot after Senna hits the wall, as no on board camera is visible.
Revealing mistake: At one scene at Yankee Stadium when the crowd is panned, someone in the background is wearing a Jeter # 2 jersey. The #2 is reversed, showing the shot was flipped.
Revealing mistake: At the very beginning of the movie when Billy is getting his hands wrapped as Eli is taping his right glove, part of the H in his fighter tattoo has been rubbed off from when his arm was resting on the chair while they wrapped his hands. (00:02:40)
Revealing mistake: When Joe drives Camille on his bike, for a brief moment if you look closely a stuntman is driving for him.
Revealing mistake: When Lou and Tommy are in the car at the park, and Tommy is taking the disguise bandage off his head, a very faint outline of Tommy's head is visible under the incomplete special effect.