Revealing mistake: In the scene where Romeo and Roy snap all the clubs other than the 7-iron, Roy drops his golf ball onto the grass. However, when he hits the ball, a white tee can be seen travelling up towards the top left of the screen. The tee can easily be seen but is much clearer in slow motion.
Continuity mistake: During the press conference at the U.S. Open where Roy begins to list the companies who are sponsoring him, he says that one of them is "Woody's Smokehouse" when the patch on his jacket says "Wally's Smokehouse".
Roy 'Tin Cup' McAvoy: This is for Venturi who thinks I should lay up.
Romeo: What does he know? He only won this tournament before you were born.
Trivia: Kevin Costner made most of his own golf shots in this film.