Residuals were rare in those days.
And the show was only 3 years. Not every cast member appeared in every episode.
98 is alot for 3 years. Standard was about 26 a year, less for hour long shows.
Was probably filmed in long periods and edited into 98 episodes.
Like game shows. They film for about 6 to 8 weeks, 10 hours a day then take the rest of the tear off.