If you have the time, you can look at the summaries of each episode on this site. If you view Episode Notes, you can see which actors did not appear in a particular episode. I know Phylicia Rashad missed a few episodes in season 3 since she was pregnant during that time, and a few others later on. MJW didn't appear in a few eps later in the series because he was in college at the time. The same for Tempestt Bledsoe as well. The only actor who appeared in every episode of the series was none other than Bill Cosby himself. Like I said, take some time and view the individulal episodes in the list.
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