The placement of the show posters on Corky's wall continually changes.
During the Chinese dinner, Sheila's wine glass contains different amounts throughout the meal. At one point it's half full, and then it's suddenly full.
After Ron (Fred Willard) deploys the whoopee cushion, he holds it up with his left hand, but when the camera then cuts to closeup, it's in his right hand.
In the Chinese dinner scene, the plate of beef to the left of Sheila appears and disappears.
The clock on the VCR in the trailer flashes (the time isn't set) in long shots but is correctly set in closeup.
During the last scene in the play, a tuba can be heard playing, but there is no tuba in the orchestra.
During the overture, the trumpet player also plays the timpani. Although there is only one drum, two distinct notes are heard, which would be impossible.
When the Stage Manager says, "We're at fifteen", her mouth does not move with the words.
After Corky shares the news of Mr. Guffman's arrival, Libby says "Wow." She then asks, "What does this mean, Corky?", but the movement of her mouth shows she's not actually saying the line.
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