Audio problem: After Shooter calls Happy a freak, there's an over-the-shoulder shot of Happy saying that he entered the tournament for one reason. As he says this line, his mouth doesn't move.
Continuity mistake: When Happy punches Bob Barker for the first time, Bob falls down a few feet away from Happy. You can see him start to get up almost immediately. But, in the shot of Bob from the front as he's standing up, he's much closer to Happy than he was in the previous shot.
Other mistake: When Bob Barker reaches up to grab Happy by the neck, his head is resting on the grass immediately before and after that shot. Happy was standing fully upright, so there's no way Bob Barker's arm could have been that long.
Suggested correction: Happy isn't standing. He's kneeling. You can see him stand after Bob grabs him.
Factual error: Since the tower became a movable object by collapsing it would be considered a movable obstruction. According to rule 24.1a of the PGA Rule book. Happy could have waited for the obstruction to be cleared then putted.
Continuity mistake: When Happy hits the AC in the window it has bigger sides to fill the window space. When the AC falls on the Mista Mista lady the extra sides are gone.