Continuity mistake: When Happy wins at the end, people start running towards him. One of these people is a girl with a blue shirt. Then there's a shot of cheering people that are standing to the side without running to Happy, including Richard Kiel, and the girl with the blue shirt.
Other mistake: When Happy is trying to "fix" the air conditioner in his grandma's room you can clearly see there is a white board in back of the machine. When the machine falls out and hits the lady on the ground you can see it's no longer there.
Continuity mistake: When Happy and Bob Barker are fighting they roll down the hill, just as it appears that Happy wins the fight Bob grabs him by the throat. Bobs pants have a small wet stain on the butt area. After he hits Happy and walks away the wet spot is the whole area of his butt.
Continuity mistake: At the Waterbury open, when Happy first putts, there a a guy telling his friend, 'this is pathetic' There is a cluster of trees right behind him. Then when Happy punches him, the trees are no where near him, but way in the distance.
Continuity mistake: In the scene where Happy is talking to Chubbs in the parking lot, when Happy hits Chubbs' hand off, you can see that Chubbs is throwing his hand rather than getting it hit off by Happy's hockey stick. You may have to watch in slow motion. (00:16:46)
Continuity mistake: Near the end of the movie during the final round of golf Happy is wearing a tee-shirt under a button shirt that is open. All through the round the tee-shirt goes from a Subway shirt to a white shirt with a brown strip across the chest. It is much more noticeable during the last putt. He has the stripe shirt while putting then when he makes it and every one rushes to him it is the Subway tee-shirt.
Continuity mistake: At the beginning when he enters the apartment he barges through the door leaving it open but when the lady walks in she has to open the door.
Revealing mistake: When Happy tees off at the AT&T Invitational, he swings his club about a foot above the ball, yet apparently he hits it successfully.
Continuity mistake: When Happy is taking grandma Gilmore to the nursing home you can see a picture of grandma on the rear view mirror. When the lady jumps on the car and Happy throws food on her you can see the picture of grandma Gilmore is no longer there. (00:09:27)
Deliberate mistake: In the beginning of the movie when Happy first discovers his swing, the balls that hit the people down the street are never visible upon impact.
Continuity mistake: During the segment where the V.W. bug hits the media tower there are a few inconsistencies. First off when the bug hits the tower the pole wraps around the front end staying intact. In the next shot it shows the pole is broken and sitting on the hood. Then there's a shot where it shows a guy laying on the ground and the bug in the background. Now the bug has backed up about 4 feet and the pole is now not broken and only bent. (01:14:18)
Continuity mistake: When Virgina hits the puck during the skating scene, the puck can be seen going in that blue area in front of the net. In the next shot, however, the puck is only halfway towards the net.
Plot hole: The bet between Happy and Shooter is in no way legally enforceable. Even if it was legal to make such a bet and it have it be enforced, the only person who can verify it was ever even made is Virginia who's obviously biased as Happy's girlfriend. The only way Shooter would actually honor the bet is to keep his word, which is completely out of character (he is the bad guy after all). And I'm sure with the money he's earned he can hire a bodyguard to protect him from Mr. Larson.
Continuity mistake: Near the start we see Happy dropping off his Grandmother at a rest home. When they arrive Happy is driving on a walkway through the compound. Odd place to be driving don't you think? (00:09:08)
Revealing mistake: When Happy jumps on the alligator in the pond, it is very noticeably a rubber (fake) alligator.
Continuity mistake: On the last hole of the big tournament, it goes from overcast to sunny between shots depending on the camera angle of Happy or Shooter McGavin.
Continuity mistake: After Happy wins his first tournament while he is talking with the blonde girl the sun is changing from shot to shot.
Continuity mistake: When Shooter's ball goes into the crowd and ends up on Mr Larsen's foot, Mr Larsen's hair is parted on his left side at the beginning of the scene, but parted on the his right side after Shooter plays his ball off his foot.
Continuity mistake: During the scene in the Subway restaurant, Virginia's cup quickly rotates back and forth 90 ° depending on the camera angle so the logo is always fully visible.
Other mistake: When Shooter is telling Happy to meet him and the other pros at the 9th green, everyone in the background is talking among themselves, then suddenly are closer and staring at them. (00:31:47)
