what did the pilot show deal with?
It uses the same title sequence as the rest of the first season but the Huxtables have only four children
The Cosby Show
The Cosby Show" pilot episode uses the same title sequence as the rest of the first season, and is widely regarded as the first episode. However, it contains a number of differences from the remainder of the series.

In the pilot, the Huxtables have only four children. 
what is goodbye mr. fish? Second episode of the of the American sitcom "The Cosby Show" what is the episode about? It focuses on the death of Rudy's pet goldfish, which was difficult to explain to her and difficult for her to deal with can you can any other episodes of the show? UNANSWERABLE
wiki:5298978
The Cosby Show [SEP] Pilot
Bill Cosby originally wanted Vanessa Williams to play the part of Sondra due to her college education and background in theater arts. However, Williams had recently been crowned the first black Miss America and pageant officials would not permit her to play the role while she was representing the Miss America pageant. Whitney Houston was also considered for the role of Sondra Huxtable, but was unable to commit to the full-time television production schedule in the NBC contract, as she was intending to be a full-time music recording artist.