Director
Ken Annakin recalled that ten days into pre-production of the film, then titled
The Italian Caper, a story reader from
MGM discovered an old script in their archives that had the same story as the film, and that script was currently being filmed as
The Happening by producer
Sam Spiegel for
Columbia Pictures. Producer
Josef Shaftel met Spiegel with the result that he had to give up his 15% share of the profits, Spiegel had the power to approve every page of the shooting script, and the film, retitled
The Biggest Bundle of Them All would not be released until six months after
The Happening (which had a delayed release). Filming began in April 1966. Female lead
Raquel Welch had just made
Fantastic Voyage and
One Million Years B.C., but the latter had not been released. She signed to make
Fathom while shooting
Biggest Bundle. "I didn't get to know Raquel Welch too well - we didn't have too many scenes together," said
Edward G. Robinson. "I must say she has quite a body. She has been the product of a good publicity campaign. I hope she lives up to it because a body will only take you so far." Male lead
Robert Wagner was under contract to
Universal who loaned him out to make the film. The interior scenes were filmed at the
Cinecittà studios in
Rome. The movie was released in France as
La Bande à César. The
B-17 airplane used was B-17G-85VE
44-8846, an actual World War II combat veteran aircraft currently being flown by the Amicale Jean-Baptiste Salis Museum. Annakin later recalled that Welch "tended to wing her lines a little bit and would keep us waiting, and I wasn't going to stand for any of this, so we had a big showdown quite early in the picture. I just said to her: `Unless you know your lines and come on time when you're called, I'm going to make sure I use you for the absolute minimum of time. I shan't do any closeups. I shall just do medium and long shots of you.' And, of course, being the woman she was, she was very co-operative after that!" ==Soundtrack==