The "impending danger" musical riffs heard in multiple scenes were later used in North by Northwest (1959). Both soundtracks were composed by Bernard Herrmann.
The same quotation from "Romeo and Juliet," Act III, scene 1 is featured here and in the episode "Bob Wire" in the final season. Mercutio describes his wound as "not so deep as a well nor so wide as a church door."
Wardrobe furnished Michael Pate with a size 7-3/8 hat for his last scene. The large numbers are visible inside the hat.
Michael Pate and June Vincent, who play Senor and Senora Rojas, both were born in 1920 and died in 2008.
Paladin loses the necktie as part of his black outfit.