- Along with Jaclyn Smith, Doyle is the only other actor who remained with Charlie's Angels (1976) for its complete five season run.
- He provided the first voice of Grandpa on "Rugrats (1991)". When he passed away, the Rugrats episode "Grandpa's Bad Bug/Lady Luck (1997)" was dedicated to him.
- Sometimes mistaken for actor Tom Bosley, who played Richie Cunningham's dad, Howard, in the TV series Happy Days (1974), because of Doyle's "Bosley" character on Charlie's Angels (1976), and a slight similarity in facial features, body type and voice.
- He played Eddie Applegate's father in The Patty Duke Show (1963) even though he was less than six years his senior.
- Upon Doyle's death, his body was cremated, with his ashes being given to his surviving relatives.
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