Revealing mistake: The actors all have the speed, form, and physique of high school athletes- not people headed to the Olympics.
Revealing mistake: When they are watching football, the mom walks in and says something to the family while she is holding 4 Pepsi cups in a cardboard cup holder with only one hand. If the cups were actually full, the way she was holding it it would have tipped over.
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 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: In most of the scenes of the film, the famous filly is impersonated by a colt.
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: During the fight montage, the winner of the first match wins by kicking his opponent in the face. His foot never makes contact.
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: 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: When Joe drives Camille on his bike, for a brief moment if you look closely a stuntman is driving for him.
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: During the Unsolved Mysteries scene, a man is about to play solitaire. Look at the screen, though. It's already dragging cards around.
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: First visit to the Malibu's house, after Jimmy enters the house, you can see the door being closed magically by itself and reopening on its own. (00:27:30 - 00:28:30)
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.
Revealing mistake: When Kathy Ireland is trying out, watch one shot from the side and you can tell by body type it's a guy in a wig kicking the ball.
Revealing mistake: When Velvet and Mi are talking to the jockey in the pub, there is a blackboard behind him listing the menu. However, all the writing is backwards. The film negative apparently got flipped, in this print at least, resulting in a reversed image. This is the only scene where reversed lettering is seen.
Revealing mistake: When Lyon's brother is set on fire he's wearing fireproof gloves and hood.
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: 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.