Forced to cut his hair in compliance with real LA County Fire Department standards, Mantooth added the phrase: "Make room for a long-haired fireman". to his autograph on technical adivisor Jim Page's copy of the pilot script.

He is half Seminole Indian.

His 7th out of his 9th year participating in an Annual All-Star-Game in Szot Park in Chicopee, Massachusetts. [29 July 2000]

Co-owns a bar in New York.

In 1997, he made a guest appearance on "Diagnosis Murder" starring Dick Van Dyke, which reunited him with former "Emergency!" co-star Robert Fuller.

Has been actively involved in several charitable causes such as The Make-A-Wish Foundation Western & Central Massachusetts Chapter and has served as a board member of Project 51.

Bought a 13-1/2 acre ranch in Agoura, California, in the 1970s that was later destroyed by the devastating "Malibu Fire" on October 15, 1978