This series was Robin Williams' first major acting role and became famous for Williams' use of his manic improvisational comedic talent. Williams made up so many jokes during filming that were considered superior to the writing staff's contributions that eventually scripts had specific gaps where Williams was allowed to freely perform. Pam Dawber found him so funny that she had to bite her lip in many scenes to avoid breaking up in laughter and ruining the take, often a difficult task with Williams' talent.