Josh Randall mentions Tom Horn. Steve McQueen portrayed Horn 22 years later in the motion picture Tom Horn (1980).
Steve McQueen and James Coburn would star together in the 'The Magnificent Seven' one year later. Steve McQueen fakes a car accident and injury so that he could get a leave of absence from Wanted: Dead or Alive so that he could take on the role in The Magnificent Seven.
Steve McQueen & James Coburn appeared together in Hell is for Heroes.
Steve McQueen and James Coburn also worked together in the 1963 feature film The Great Escape.
When Josh reads from a notebook belonging to his friend Jesse, played by his "Nobody throws me my own guns and says run. Nobody." Magnificent Seven co-star James Coburn, the last in a list of names is 'Tom Horn'; who, coincidentally, he would portray in the movie just before playing 'Papa Thorson', a modern day bounty hunter, in his final role.