We know the Twins got away with stuff in the 1991 World Series, but the man who broadcast the 1987 World Series thinks the Twins were messing around then too:
You’ve heard the accusation before: Fake crowd noise.
Does Al believe in Metrodome audio miracles? Yes! . . .”I’m going, wait a minute. This is a baseball game,” Michaels told the host, NBC colleague Mike Florio. “Nobody is screaming like this when the fifth inning starts. … To me, there was no question” that the crowd noise was not natural.
This is what happens when you allow baseball to be played in domes.