According to the audio commentary on the DVD, Fox wanted to do another "Flint" movie but James Coburn turned them down.

According to an interview James Coburn did over twenty years after this film's release, Twentieth Century Fox commissioned this film almost as soon as its predecessor, Our Man Flint (1966), opened, early in 1966 (to big box-office success). However, Coburn said, the studio showed little interest in the sequel thereafter and rather threw it together, with director Gordon Douglas also showing little interest. Coburn claimed that he and stunt arranger Robert 'Buzz' Henry (credited as second-unit director) had between them directed a great deal of the finished film.

This was the final film that "Twentieth Century Fox" produced in its CinemaScope process. Later productions shot in anamorphic widescreen would use Panavision or other optics.

As Flint's just about to board his jet (with the company name clearly seen), the gray-haired, white-jacketed gentleman who greets him is founder/inventor of the jet which bears his name, William Lear (listed in the credits as W.P. Lear, Sr.). Flint even jokingly asks if the ashtray's been cleaned.

In a shot during the opening credits, Lisa takes away a movie magazine from a one of the women under a hair dryer at Fabulous Face. The cover of the movie magazine shows Fantastic Voyage (1966), also produced by Saul David.

Continuity

The tail registration number of Flint's private Learjet changes from ending in an "L" under the jet's engine to an "LJ" in flight.

When Cramden visits Flint at his apartment, Flint's robe goes from being untied and open, to partially closed, to closed and tied, and then back to open.

When Flint flees Natasha's apartment, there are three KGB agents pursuing him. He throws one off the ledge but later there are still three pursuing him - two on the roof of Natasha's building and one on the roof of the small tower where Flint is.



Revealing mistakes

Obvious mannequin when the president's double kidnaps the real president.

When Flint is holding Natasha the ballerina up in the air, the lifting wires are visible behind Natasha's left arm.



Anachronisms

In the theater when Flint is performing ballet with Natasha and it shows the audience clapping at the end, the scene is apparently taken from another period film as the characters are dressed in military uniforms and female costumes of the 19th century.



Crew or equipment visible

When Flint is first in Cramden's office, the fake-pencil eavesdropping device is lying broken on the floor, but the wire powering the little blinking light inside can be seen running across the carpet.

When Mr. Cramden visits Flint to ask him for help, a crew member's shadow is clearly visible on the wall behind him, as he is being told to smile and lower his hand slowly so he doesn't get bitten by the dog.



Plot holes

When Cramden lights 2 cigarettes, one for him one for her, he is drugged by the laced paper when he smokes it, but she isn't effected by the drugged cigarette she smokes.



Character error

When the Flint girls tell Flint they're going to Fabulous Face in the Virgin Islands, one of them tells Flint that it is only a couple of hours from Rio. Rio is over 3,000 miles away from the Virgin Islands. Not even the Concord could fly there in a 'couple of hours'; and the Concord didn't start flying until 2 years after the movie was released.