In the marimba spiritual, when the 2 guys are playing the set of 4 drums and cymbals, the cymbal on the left side of the screen falls off, but in the next shot it is back on, and in the next shot it is off again. This is because of the show being filmed on 2 different nights.
In the intermission performance, the audience changes from shot to shot. The easiest way to see this is by watching the woman with the white shirt behind the middle guy. From the upper shot to the strait on shot, she disappears and re-appears throughout the performance.