Became a life member of the Society of Colonial Wars in the State of California on July 13, 1928 based on his direct descent from Capt. John Marshall, 1700-1795. His General Society membership number was 7810 and his California Society membership number was 364.
Cartoonist Chester Gould drew his comic-strip character Dick Tracy based on Holt's granite-jawed profile.
Ex-father-in-law of William Bakewell.
Father of actors Jennifer Holt and Tim Holt, with the latter of whom he bit-played in John Huston's The Treasure of the Sierra Madre (1948).
Great grandfather of Shaeffer Holt.
It is reported that he was cartoonist Al Capp's favorite actor, and Capp drew his bumbling detective character Fearless Fosdick to closely resemble Holt.
One of the 36 founders of the Academy of Motion Picture Arts and Sciences (AMPAS)
The only time he, Tim Holt and Jennifer Holt worked together was in 1946 when the three appeared together on a CBS radio program entitled "All-Star Theatre", a country-flavored show featuring Western music by Foy Willing and the Riders of the Purple Sage with a dramatic sketch. The Holts played father, son and daughter.