Sir Sean Connery was greatly impressed by Sir Ralph Richardson, whom he has often described since as his favorite actor.
During the swimming sequence on the raft with Gina Lollobrigida, Sir Sean Connery's voice is dubbed.
There were some concerns over Sean Connery being cast as a villain, because of the risk of his heroic image being compromised.
Ralph Richardson's character's butler in this film is called Baines. Sixteen years earlier, Richardson played the French ambassador's butler named Baines in The Fallen Idol (1948).
The white tuxedo Sir Sean Connery wears in this movie is the same one he wears in the pre-title sequence of Goldfinger (1964). The jacket even has the initials "AR" sewn on the inside, which stands for his character's name Anthony Richmond.