Irene Cara appeared in the episode "Rerun Gets Married".
Tim Reid appeared in the episode "It's All in Your Head".
Tearjerker: The episode where Dee (yes, THAT Dee) befriends a rather gruff old man while her brother is in the hospital. Her reaction to his death, in addition to being a Tearjerker, is also a Crowning Moment of Heartwarming . Dee tells the man's daughter that he'll be all right because you can't get hurt sliding into a cloud.