Trivia
A court ruled that the series was not a spin-off from the television show M*A*S*H; rather, that it was a spin-off from the film MASH.
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Wayne Rogers, who played Trapper John in M*A*S*H, turned down the role because he did not want to play a doctor again on television. (He later played a doctor on the television show House Calls, itself a spinoff of a movie, House Calls.)
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When Mary McCarty died during the hiatus between the first and second seasons her absence was explained by having her character get married and move away.
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During the course of the show, Trapper drove three different cars: 1978 Mazda RX-7, 1980 Dodge Mirada CMX-360, 1983 Cadillac SeVille.
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Pernell Roberts publicly denounced series television when he left Bonanza for theatre in 1965. He decided to return to television because his salary would help support his aging father. He also felt that he would be able to exercise his acting range and address social issues, two things he felt he was rarely able to do on "Bonanza".
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