Dave Eiland, who played a relief pitcher in the bullpen and celebration scene, was also Kevin Costner's pitching double in some long shots.

Many of the Yankees players were played by Yankee minor leaguers.

One of the baseball players is Scott Pose, the first player to bat for the Florida Marlins franchise (in 1993).

All four umpires were played by real Major League umpires.

The baseball gloves used by the actors were broken in by the NYU baseball team.

Facing Ken Strout in the bottom of the 9th inning, Chapel says to himself "Think Billy, don't just throw." In the film _Bull Durham_, Costner's character Crash Davis gave the opposite advice to pitching protege Nuke LaLoosh when he said, "Don't think. Just throw."

The shots of Billy Chapel's parents at the beginning of the movie are Kevin Costner's actual parents.

A lot of the Yankee hitters use actual Yankee stats from the 1998 season. An example is Matt Crane, the pinch hitter to lead off the ninth. He was hitting .373 with 10 HRs and 27 RBIs. These were Shane Spencer's stats in 1998. Davis Birch used Paul O'Neil's stats.

Half of spectators in stands were "virtual" cardboard people.

The book next to Billy Chapel on the airplane after he finds Heather is "The Killer Angels". This book was also written by Michael Shaara, who wrote "For Love of the Game".

On the DVD, under the "on the mound" section, you can answer a series of questions about the perfect game. If you answer all of these correctly, you will get an Easter Egg: the short black and white film "Play Ball with Babe Ruth" will play.

The scene in which the ball bounces off of Mickey Hart's head is based on the famous incident in which the same thing happened to Texas Rangers outfielder Jose Canseco. Afterward, when Billy and Mickey are talking in the clubhouse, Mickey jokes "It'll probably end up on ESPN." In fact, Canseco's incident became blooper reel fodder for ESPN for the remainder of that year.

The manager of the New York Yankees is played by Augie Garrido, who befriended Kevin Costner while he was the head coach at Cal State Fullerton. Garrido is currently the head coach at The University of Texas and the two remain good friends.

Continuity

When Mickey Hart saves the would-be Davis Birch home run in the 8th inning, the initial close-up shot sees the hands of fans vying for the ball, but when shown from distance Hart makes the catch on a part of the wall that is nowhere near any spectators.

In the 9th inning of a night game, Billy looks at the crowd in the upper deck and they are in broad daylight.

At the end of the third inning, the last Yankee hitter is walking up the first baseline complaining loudly about a called third strike. We know he is the sixth batter because he bats third in the eighth inning (and if it's in the midst of a perfect game, he's batting sixth in the lineup). At the end of the third inning, it'd be the ninth batter that had just struck out, not the sixth batter.

At the end of the seventh when Tuttle argues with the 1st base umpire, the Yankees manager is seen running out to 1st to argue with the ump, too. A few frames later when there is a close up of Chapel walking off the mound, although it is blurry in the background you can see the Yankees manager running to 1st base again.

As the third inning ends the TV network scoreboard graphic indicates that neither team has any hits, runs or errors. Moments later a shot of the Yankee Stadium scoreboard indicates the same thing. However, when the fourth inning starts TV announcer Vin Scully states that the Yankee pitcher has allowed two hits.



Factual errors

Baseball has a rule saying that any player who has been in the MLB for 10 or more years, and has played the last 5 or more consecutively with the same team has a full no-trade clause. Having played the last 19 for the Tigers, so they could not have traded Kevin Costner's character without his permission to do so.

When Gus Sinsky is at bat and gets his double, one shot shows the sun in front of him. With the orientation of Yankee Stadium, the only time the sun could be in that position is in the morning, but the game time is late afternoon/evening.

Billy Chapel would not be able to be traded to the Giants. He could invoke the 5/10 Rule whereby players who have been with a club for at least 5 consecutive years and have been a major league player for at least 10 years cannot be traded without their consent. However it is mentioned that he will be a free agent at the end of the year, at which time the new ownership can simply choose not to re-sign him to a contract with the Tigers.

Before the last game Vin Scully talks about the Yankees having the chance to clinch the "Pennant" on the next to last day of the season. The pennant goes to the champion of the American League. In order to win the Pennant you have to win a divisional playoff, then the American League Championship Series. You cannot win a pennant in the regular season.

When Billy shows he is in pain for the first time, it's after a high and inside pitch to the batter. After the manager and catcher leave following the conference on the mound, you can see on the outfield scoreboard 0 balls and 0 strikes and it has to at least be 1 ball.



Incorrectly regarded as goofs

The shirt he has on under his jersey had the "home" white "D", instead of the road colors - orange "D". However, there are no regulations as to what a player wears UNDER his jersey/uniform. Billy might simply have chosen to wear a home t-shirt, for any number of reasons.



Revealing mistakes

In the beginning of the movie, one of the newspaper's headlines states, "Chapel Pitches Lincoln To Title For Second Straight Year." All of the bold print is about Chapel's high school career. However, all of the print is concerning a game the previous night between Detroit and New York in which Billy Chapel pitched.

In the ninth inning of Billy's perfect game, a foul ball is hit by a Yankee into the stands. The negative is flipped - a fan's shirt has the name "Jeter" spelled backwards along with his uniform number "2".



Miscellaneous

At approximately 1:34 and again a minute later, when Davis Birch (54) steps up to bat in the 8th, the scoreboard behind the pitcher clearly shows 61 for the DH (Mike Robinson) as the lead-off batter. He would have been next at bat had Ken Stroud made first base. After the game we see 61 going down into the rooms. No error here at all. Plus, he doesn't even look like Stroud.



Anachronisms

When Mickey Hart makes the leaping catch, to save the home run, you see an advertisement on the right field wall. Yankee stadium would not have any advertisements there until the 2005 season.



Audio/visual unsynchronized

During the third inning when Billy throws three pitches, all of which are preceded by the announcer saying 'Strike Three,' the same player's picture can be seen on the screen in deep right center field in the background.



Errors in geography

When they show the scene by air of a city, the text across the screen says Lakeland, Florida. This is false, there is no ocean on the border of Lakeland, it is about 1.5 hours from the West coast, directly East of Tampa, Florida.

When Jane arrives at Winter training, she tells Billy about her flight to Lauderdale. The Detroit Tigers Winter Training is in Lakeland, FL, near Tampa. She would have flown into TPA, Tampa International Airport.



Character error

When the last batter in the 9th inning comes up to the plate and takes his practice swing, you can see he is wearing #60 on his uniform. When he goes back into the dugout, he is wearing #61.

At one point while announcing the game, Vin Scully describes calling Don Larsen's perfect game in the 1956 World Series, then states that "I never thought I'd be able to see another one." In real life, Scully had called additional perfect games in 1965 (by Sandy Koufax) and 1991 (by Dennis Martinez).

Chapel mentions on the plane that he'll be pitching tomorrow and the radio broadcast mentions on game day that it is the second to last day of the season. It is highly unlikely, if not impossible, that a pair of Major League teams would end the season on a 2 game series.