- Did commercials for Chrysler and Kool-Aid.
- Wife Sandy is a singer and writer. They have four children.
- In an interview with Michael Barnum for a Classic Images article (November 2009), Gregory stated that he auditioned to be a Mousketeer for "The Mickey Mouse Club" in the mid-1950s but was turned down because his singing/dancing abilities were not "good enough".
- Was selected to appear on Art Linkletter's kid's TV interview show but contracted the measles and couldn't go on.
- Got the part of Betty Hutton's son in Let's Dance (1950) because he had the same blond hair and blue eyes as the star. Paramount put him under contract after that.
- Left acting at the age of 13 and went on to become a professional bowler. Later he became a Las Vegas casino dealer and a manager of a bowling center in California.
- His mother and father were both actors. His mother was billed under the stage name of Gladyce Roberts and appeared as a dancer in the film Flying Down to Rio (1933). His singing father, Bob Moffett, worked in burlesque with Billie Burke.
- The younger brother of child actress Sharyn Moffett, his first movie role was an uncredited part in The Judge Steps Out (1948), which prominently featured his sister.
- Blond, blue-eyed child actor of the 1950s who appeared in the cult classic Robot Monster (1953), which was listed in the Harry Medved book The 50 Worst Films of All Time.
- He and sister Sharyn Moffett both had parts in a radio version of "A Christmas Carol". He played Tiny Tim.
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