Trivia: Cesar Romero refused to shave his moustache for the role of Joker, so it's still visible under his makeup.
Trivia: Director Gerald Thomas provided the monster gibberish for Oddbod Jr.
Trivia: There is no dialogue in the first 10 minutes of the film.
Trivia: This was Alfred Hitchcock's 50th movie.
Trivia: Although the main character is listed in the credits as "Man", he is referred to early in the film as "Larry".
Trivia: The Grinch's face is partly based on Chuck Jones' own face. Jones said he tended to sneak his face in without even realizing it. (Source: NPR).
Trivia: The number of the Berlin hotel room Bruno Stachel stays in the night before he is to be awarded the Blue Max is '22', which equals the number of planes he has shot down. He needed only 20 to win the award, but he had to shoot down two more in order to make up for Willy's kills that he claimed as his own earlier in the film.
Trivia: Just after Linus seals his letter to the Great Pumpkin in an envelope, he walks past Lucy who is sitting on the floor watching TV. In her hands, Lucy is holding an issue of TV Guide Magazine. On the cover? Lucy, sitting on the floor in the same position, wearing the same blue dress. (00:07:00)
Trivia: Fred Gwynne (Herman Munster) and Al Lewis (Grandpa/Count Dracula) worked together previously on "Car 54, Where Are You?" This is referenced playfully after Herman and Grandpa discover the secret of Munster Hall.
Trivia: The band leader in the saloon bar is the film's composer Eric Rogers.
Trivia: Steve McQueen received his only Oscar nomination for his performance as Jake Holman in this film.
Trivia: Audrey Hepburn's movie wardrobe was designed by the famous fashion designer, Givenchy. During the film, Peter O'Toole jokingly comments to Hepburn that the cleaning woman disguise she is to wear for the heist will, "give Givenchy a night off."
Trivia: Kate Reid was only 8 years older than Natalie Wood, who plays her daughter.