When Arsenio grabs paper towels off the roll to blot beer from his face, he unrolls a large amount which hangs down to the counter. When he wipes his face, there is only a half-sheet of towel on the roll, then it switches back to several hanging sheets in the next shot.
Arsenio's shredded tie changes between shots. Obviously 2 differently shredded ties were used.
In the "Mondo Condo" segment, while Arsenio Hall is struggling to get his necktie out of the garbage disposal unit, he knocks over the beer can. But in the next shot, the beer can is still on the counter.
In the "Amazon Women on the Moon" segment, when the astronauts realize the moon has oxygen, Butch takes off his helmet and says, "Good old H20." Oxygen is 02; H20 is water.