The accident involving the wagon carrying Martha (Maureen O'Hara) and Hilary (Juliet Mills) ahead of the stampede was real. The women were supposed to be thrown clear, but instead, the wagon rolled over them. Fortunately, there was a camera pit underneath the wagon allowing the stuntwomen, Stephanie Epper and Patty Elder, enough space to be kept from being crushed. They survived with slight injuries and shock. Director Andrew V. McLaglen kept the scene in the film.
Brian Keith and Maureen O'Hara star in Die Vermählung ihrer Eltern geben bekannt (1961), in which Juliet Mills' younger sister, Hayley Mills, plays their twin daughters.
It was initially announced that Hayley Mills would appear in this film until her sister Juliet Mills was cast instead.
The film is one of the early major productions to be scored by John Williams, who is billed as "Johnny Williams" in the opening credits.