- Former member of the Keystone Kops.
- Brother of writer/actor Eric St. Clair.
- St.Clair's second wife, Margaret Holt, was the daughter of Californian E.M.Murray who invented the sliding ladder for shoe stores.
- In 1936, the press announced that George Beranger, Frank Borzage, St. Clair, Tom Brown, Alan Mowbray,Henry Mollison, Guinn 'Big Boy' Williams, and Boyd Martin of the Louisville Courier-Journal were selected to attend a dinner held in honor of D.W. Griffith and Mack Sennett.
- He was good friends with George Beranger, with whom he worked many times.
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