Long before Taxi Driver (1976) or even Dirty Harry (1971), the Jackie Rhoades character - as he looks a mirror - is the first to deliver the famous lines "You talkin' to me? You talkin' to me?".
Jackie Rhoades says "George" 56 times. 20 of them are within the first two minutes of the episode.
One of only four The Twilight Zone (1959) episodes to exclusively use, aside from Rod Serling, only 2 onscreen actors. The others are Two (1961) starring Elizabeth Montgomery and Charles Bronson, A Game of Pool (1961) starring Jack Klugman and Jonathan Winters. And finally the highly controversial and temporarily banned episode The Encounter (1964) starring Neville Brand and George Takei.
The music for this episode was composed by Jerry Goldsmith who, coincidentally, also wrote the score for the 1974 film Chinatown (1974), in which Joe Mantell played a major supporting role as the partner of Jack Nicholson's character.
Although Rod Serling mentions that Jackie is 34 years old, Joe Mantell in real life was 44 years old.