- One of the first movies to market itself with a making-of documentary aired on TV. Gig Young hosted the program, which introduced new hearthrob 'Hunter, Jeffrey' .
- In the climactic scene, 'Wayne, John' and 'Wood, Natalie' run up the side of a hill in Monument Valley, Utah... and come down the other side of the hill in Bronson Park, Los Angeles (1,200 miles away!).
- Western star Harry Carey died in 1947. Director Ford cast Carey's wife (Olive) as Mrs. Jorgensen (the mother) and also Carey's son (Harry Carey Jr.) as one of the sons (Brad) as a tribute to Carey. In the closing scene with John Wayne framed in the doorway, Wayne holds his right elbow with his left hand in a pose that Harry Carey fans would recognize as one that Carey often used. Wayne later stated he did it as a tribute to Harry Carey. Off-camera, Olive Carey watched.
- Lana Wood played young Debbie Edwards and Natalie Wood who was Lana's older sister of 8 years played teenaged Debbie Edwards.
- The Mexican man who takes the searchers to meet Chief Scar is called Emilio Gabriel Fernandez y Figueroa. The name of this character played by Antonio Moreno is a combination of the names of Mexican actor and director Emilio Fernandez and his cinematographer 'Gabriel Figueroa' .
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