- He was the earliest born actor to appear in a "Star Trek" film or television episode. He played Robert Johnson in The Deadly Years (1967). Along with Judith Anderson, Morgan Farley, Richard Hale, Anthony Jochim, Celia Lovsky, Leonard Mudie, Charles Seel, Bill Borzage, Abraham Sofaer and Ian Wolfe, he is one of only eleven "Star Trek" actors to have been born in the 19th Century.
- Prior to starting his acting career, Felix had been an inventor who held over 100 copyrights and patents relating to a unique mapping system that he used when lecturing military officers, and an insurance salesman.
- He is buried next to his son Jon Hall in Forest Lawn Cemetery in Hollywood Hills.
- Former father-in-law of actress Raquel Torres.
- Father of Jon Hall
- Former father-in-law of singer/actress Frances Langford.
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