- Gave a 15-year-old Elizabeth Taylor her first screen kiss in Cynthia (1947).
- Lydon is a licensed pilot.
- Did not enjoy the Hollywood experience as a juvenile. He appeared on Broadway and films initially to help support an alcoholic father and family of nine children. He had practically no education as a result.
- Real-life son-in-law of actress Olive Blakeney, who played his mother in all but the first of the "Henry Aldrich" film series.
- Was directed in "Joan of Arc" by Victor Fleming, but told film critic Leonard Maltin in an interview that he (Lydon) did not have a high opinion of Fleming's working method as a director.
- (1997-) Runs his film company, Spectrum.
- Grandson of professional wrestling champion Jim Londos.
- Interviewed in Tom Weaver's books, "I Talked with a Zombie" (McFarland & Co., 2008) and "A Sci-Fi Swarm and Horror Horde" (McFarland & Co., 2010).
- Interviewed in "Encyclopedia of Feature Players of Hollywood" by Tom Goldrup and Jim Goldrup (BearManor Media).
- Son-in-law of actors Bernard Nedell and Olive Blakeney.
- From 1950 to 1952, he starred in what is considered to be the first network TV daytime soap opera, CBS' The First Hundred Years, performed live five days a week.
- No relation to John Lydon (aka Johnny Rotten) of the Sex Pistols, despite a popular misconception.
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