Continuity mistake: During the opening day game, the angle of the shadows changes drastically between shots. (00:21:20)
Continuity mistake: During the final game, the announcer says that Harris is "working on a seven hitter." He then gives up a double, but multiple shots of the scoreboard after that show the Yankees still with only 7 hits. (01:26:35 - 01:27:24)
Other mistake: In the scene before the one game playoff Bob Uecker states that the Indians are going for their first league championship in over 30 years. In reality the win gives them a division championship and not a league championship. (01:20:08)
Factual error: In the ball park the sign for NBC says channel 4. In Cleveland, NBC was and still is on channel 3. (Filming took place at the old Milwaukee County Stadium, former home of the Braves and Brewers, hence the NBC, WTMJ channel 4 sign. Still a mistake, but there's the explanation.) (01:33:40)
Continuity mistake: In spring training, Lou Brown and the other coach walk over to check out Charlie Sheen's pitching. When Lou says "all right, let's see what you can do," the coaches are pretty much either side of a post supporting the fence, with a "no pepper" sign to their right. When Sheen pitches, the two coaches have suddenly moved about 6 feet over, away from the post, with the no pepper sign directly between them. (00:15:15)
Continuity mistake: With Vaughn pitching in game 121 (current record 60-60), he gives up a walk and then a double (according to Harry Doyle). Then he gives up the three-run homerun to Heywood - runners are shown running from first and third, and the guy from first is in a full sprint, which wouldn't happen on the shot that Heywood hit.
Continuity mistake: During the scene where Harry Doyle announces that Ricky Vaughn is one out away from his first major league victory and Vaughn is about to pitch to the A's Mike Rexman, watch as catcher Jake Taylor leaves homeplate and comes up to give Ricky some pitching advice. There are only a handful of people in the stands behind home plate (roughly 20). However, not even 30 seconds later when Taylor walks back to the plate and Mike Rexman stands in to bat, the area behind home plate is now FULL of fans, probably 100 or more. (00:54:35)
Factual error: Shots of the first game or two have angles of the batters' shadows facing behind home plate (or in other words the sun is around left to center field in some shots). In major league games, that would not be a possibility due to baseball rules that the sun can not be in the batter's eyes.
Continuity mistake: In the scene where Willie Mays Hays is stealing home in the final game, the first baseman throws to the catcher. The catcher catches it - with his shin and left foot lying directly across home plate. It switches to an overhead shot, and the catcher is a good five or six feet away from the plate.
Continuity mistake: At the end of the movie when the Indians are playing the Yankees, in the 9th inning Hays is on 2nd and starts to steal 3rd. Taylor bunts the ball and the 3rd baseman and shortstop are shown in the camera view, but Hays is nowhere to be seen. He should have been in the camera shot as he had not reached 3rd base yet.
Other mistake: Roger says to Jake that he's going to be a free agent next year, which he's excited about and why he doesn't want to risk injury, but then when he learns of the owner's plan and that he'll be given his release next year, which is the same as free agency, he's upset. Plus you can't be given your release when your contract ends, which it must be if he thought he was going to be a free agent.
Continuity mistake: In the playoff game against the Yankees, right after Uecker announces Harris (the pitcher) is in trouble, there is a shot of him from behind the mound. It's a little out of focus, but look at his hair from under his cap. It doesn't match his hair in the next shot where you see him throwing a pitch. (01:22:35)
Continuity mistake: When Lou Brown and the pitching coach are working with Vaughn, walk over to the plate and stand on either side of Taylor (to simulate a batter on either side). In the first shot, you can see a "No Pepper Games" sign off to the left side, the shot cuts to Vaughn, and then back to the coaches and Taylor. All of a sudden, the sign has moved from over on the left side on the backstop, to directly above Taylor on the backstop and Vaughn proceeds to smash it with a high fastball. Another mistake entry said this: In spring training, Lou Brown and the other coach walk over to check out Charlie Sheen's pitching. When Lou says "all right, let's see what you can do," the coaches are pretty much either side of a post supporting the fence, with a "no pepper" sign to their right. When Sheen pitches, the two coaches have suddenly moved about 6 feet over, away from the post, with the no pepper sign directly between them. The coaches didn't move, the sign did. There's only one home plate there. How could the plate move? It had to be the sign. (00:15:15)
Continuity mistake: In the top of the ninth, as Harris struggles with his control a shot of the scoreboard shows both teams have 2 runs, 7 hits and no errors. Harris then walks the next batter to load the bases, and Vaughn is brought in to face Heywood, whom he strikes out. Thus the Yankees should still have 7 hits heading into the bottom of the ninth. Yet when the scoreboard is shown as the Duke comes in shows the Yankees with 9 hits. This means they somehow picked up 2 hits in between the half-inning, which is impossible. The only way to gain hits like that is if the scorekeeper changed two errors from earlier in the game into hits, but the scoreboard indicated there no errors were ever made in the game. (01:27:20 - 01:33:30)