Cliff (Cosby) is sitting on the couch reading an issue of Essence magazine that has his real life wife Camille Cosby on the cover. While reading it he holds the magazine straight up so it is clearly visible that it is Camille Cosby.
After Cliff writes lines of "I will not do my child's homework" on the blackboard features some improvisation done by Bill Cosby. Originally, after Mrs. McGee (Elain Stritch) chastises Cliff for employing the childish tactic of writing the lines in large letters, Cliff was supposed to write the sentence once in normal-sized letters. However, Cosby instead begins to write in tiny letters. When Stritch turns around, she is taken off-guard and needs to turn from the camera to hide her laughter and struggle to maintain her composure as she delivers her following line.
Cliff sits on the couch reading an issue of Essence Magazine with Bill Cosby's real-life wife, Camille Cosby, on the cover. He holds the magazine straight up so the cover photo is clearly visible.
When Dr. Huxtable is discussing Rudy with Mrs. McGee, she mentions that Dr. Huxtable was in similar situations when she was teaching both Denise and Vanessa. This would imply that she has taught Theo as well, but probably not Sondra as she wasn't mentioned.