Trivia: If you listen very carefully to the part where Al MIchaels says, "Do you believe in miracles? YES...", you'll notice that it's from the original broadcast of the game in 1980. All other play-by-play was re-done by Michaels as the movie was produced. The reason they used the original 1980 broadcast for just that specific moment is that Michaels had a difficult time recreating the emotion and excitement he felt when shouting it as it really happened.
Trivia: Make sure to stay after the credits have ended. There is an extra scene with Ben Stiller looking very different. (01:28:05)
Trivia: There are only 500 balls placed on the wall in Stan's, enclosed in a glass case behind the bar. The crew kept on moving the panels depending on the shot needed.
Trivia: Scenes for the film were filmed during the Wimbledon tournament 2003. The actors would walk out on court at the beginning or end of a match as though they were really competing. The officials and spectators were actual tennis officials and spectators, rather than extras. It is the only time in the history of the tournament that this has been allowed.