Alternate versions

In the Region 2 DVD which has English, German, French, Italian and Spanish audio tracks, the ending is left instrumental in Spanish audio track unlike the others.

In the Region 2 DVD, in the French audio track, the music bit before end credits is dubbed in French.

Contemporary reviews of this film mention an opening sequence that spoofs the Bond films' "gunbarrel" opening, only instead of us hearing a gunshot, we hear a popping cork. Perhaps it was thought to be too similar to the opening of the regular Bond films, because TV and video prints instead use a short Peter Sellers sequence from the middle of the film as the "teaser."

The R1 DVD version now has the MGM logo at the beginning instead of the Columbia logo like in all other prints

According to the book, The Bond Files, the film was never shown with anything other than the Peter Sellers in Paris opening sequence. It's possible the gun-barrel parody if filmed was removed before general release.

A short version of Casino Royale (1967) is regularly shown on Swiss television. This cut, approx. 93 minutes long, is reformatted in 1.85/1 ratio. In this shorter version, many scene have been cut, like the car chase between David Niven and the girls. The scene between Peter Sellers and Ursula Andress has been shortened. The "look of love" part is not in this version, like the "dreaming scene" when Peter dreams that he makes love to Ursula. In the Berlin sequence too, the version of "What's New Pussycat?" that the protagonist hears when they open the sewer is different.

In the featurette "Psychedelic Cinema" (on the DVD and possibly made for TV), Val Guest mentions that because Peter Sellers was "unavailable" for the ending cloud scene, the producers made a giant cutout picture of him and put it in the back; later prints replaced this with recycled video footage of Sellers, altered to have the same look as the rest of the scene.