Continuity: During the trailer bedroom scene, one camera angle shows a woven blanket, a different angle shows a smooth blanket.
Continuity: The amount of sweat on Roy's shirt when he walks out of his trailer and talks to Molly.
Continuity: The positioning of Roy's glass of milk while he and Romeo are discussing the Open and putting together the puzzle in the Winnebago.
Continuity: During David Simms' charity golf tournament where he employs Roy (Tin Cup) as his caddy, the word 'NISSAN' on David's cap disappears and reappears again.
Continuity: Roy's entourage is seen behind him on the 72nd hole of the Open and also in the stands behind the green.
Continuity: Molly's hair when she is on the telephone to her college psychology professor.
Continuity: As Roy steps out of the trailer and talks to Molly, the hair over his forehead changes from inside the hat, to outside and in again between shots.
Continuity: When Roy visits Molly at her office, his collar is sometimes well-adjusted and sometimes the left side larger then the right.
Errors made by characters (possibly deliberate errors by the filmmakers): During the press conference when Roy is listing his sponsors, he says "Woody's Smokehouse" when the patch on his shirt says "Wally's Smokehouse".
Continuity: During the opening credits and the opening scene, the range is shown at twilight, and Roy hits balls into the setting sun, yet when he and his entourage enter the pro shop, the light coming through the blinds, as well as the view of the range through the front door clearly show it to be daytime. When Roy and Molly step outside to begin her first lesson, it is twilight again.
Continuity: In the bar following the first round of the US Open, the Brickyard 400 NASCAR race is on the TVs. This race is held the first weekend of August every year; the US Open is always in June.
Continuity: At the start of the last round of the US Open, Simms's hat goes back and forth from being blank to saying INFINITI when he is talking to Tin Cup on the first hole's teebox.
Errors made by characters (possibly deliberate errors by the filmmakers): According to the US Golf Association, a player can borrow a ball from another player, so if Roy hit his last ball into the water, he would not necessarily have been disqualified, as Romeo stated.
Factual errors: On the second hole of the final round Roy's ball runs just short of the green after hitting it off the toilet but Roy is still given credit for hitting the green.
Errors in geography: CBS golf producer Lance Barrow offers that Salome is in West Texas near Floydada. Floydada is in the panhandle about 60 miles east of Lubbock, not near Fort Stockton as the road signs at the first of the movie suggest. Barrow is from Floydada and was probably giving a shout out to folks back home.
Continuity: When teeing off on the 18th hole during the final round Turk can be seen in the crowd behind the tee box. Later, during the play of the same hole, he is in the bleachers alongside the 18th green. An incredible sprint for a 300 pound man.
Factual errors: In the bar after the first round, Roy commented that he didn't shoot an 82 because he missed a four footer on the 18th. The scoreboard showed that Roy shot 5 (par) on the 18th to shoot 83. Yet, following Roy's shot into the water on the 18th in the third round, Jim Nance (TV Commentator) stated that he had found the water for the third straight day. If Roy had put the ball in the water with his second shot on the 18th in the first round and missed a four footer on that green the best score he could have had would have been a 6. (Drive + shot into water + penalty stroke + approach shot + missed putt + made putt = 6)
Plot holes: On the last hole of the Open when Roy finally puts the ball in the cup and then proceeds to toss it into the water, several guys trample across the green and dive in the pond to retrieve the ball and hoist it up once found. There is no way they would have been able to distinguish that ball from the other balls he hit into the drink. Not to mention they would have been tacked by security as his partner still needed to complete his hole.