- Studied at the Pasadena Community Playhouse alongside George Reeves, who was among his closest friends. He was best man at Reeves's wedding and they appeared in eleven films together.
- Served on the Screen Actors Guild Board of Directors.
- Honorary mayor of Granada Hills, California during the 1960s.
- In the film noir classic Dark Passage (1947), there is an 8x10 photo shown in the film of Humphrey Bogart's character before his face goes under plastic surgery. The actor's face in the photo is Frank Wilcox.
- In the final release print of 1951's Show Boat (1951), Wilcox, as a poker player, had no lines -- unusual for a familiar supporting actor who usually had a speaking part. But his role may have been a little more substantial in the rough cut, because the scenes of Gaylord Ravenal and Magnolia's "winning streak" in Chicago were trimmed some after it was decided that they slowed down the film.
- He appeared in three Best Picture Academy Award winners: Gentleman's Agreement (1947), All the King's Men (1949) and The Greatest Show on Earth (1952).
- Well established as a character actor already, he gained renewed interest as Cousin Pearl's love interest in early episodes of the popular 1960's sitcom "The Beverly Hilbillies.".
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