Thunderball/Trivia

Enforced Method Acting: Sean Connery and the sharks in Largo's pool.
The Other Darrin: Felix Leiter is recast yet again, this time with Rik Van Nutter. Possibly happened with the voice of Blofeld as well, as various sources claim that Joseph Wiseman (the titular Dr. No) took over the role from previous actor Eric Pohlmann in this film, while yet others say that it was still Pohlmann.
Same Language Dub: Both Adolfo Celi and Claudine Auger were dubbed over.
What Could Have Been: Johnny Cash recorded his own version of the theme song.