Other mistake: During the dinner party scene, Carl is going gopher hunting. The shot of him approaching the tree shows it's daylight in the background, when the previous shot showed it very very dark out.
After things at Bushwood come to a head, Al (Rodney Dangerfield) challenges Judge Smails (Ted Knight) to a round of golf for $10,000. Al partners with Ty (Chevy Chase) and the Judge with Dr. Beeper for the match, raising the stakes to $20,000 per pair. Al injures himself after playing a lousy first nine holes and then doubling the bet; Ty subsitutes caddy Danny Noonan (Michael O'Keefe) for Al with the Judge's permission. Danny makes the winning putt just as Carl (Bill Murray) blows up the golf course while trying to kill the gopher; after rashly doubling the bet again, the Judge and Dr. Beeper now owe Ty and Al $80,000. The gopher lives.
Trivia: The scene where Ty is practicing late at night before the big game and "plays thru" at Carl's place was actually filmed after the movie had already wrapped and was largely improvised. The film makers thought a scene with Chevy Chase, who had left Saturday Night Live after the first season, and Bill Murray, who had replaced Chase in the second season, would be a nice comic touch, so they added one (literally) at the last minute.
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