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Goldfinger’s voice was dubbed
You would never have guessed it from his accent in the film, but the villain Goldfinger was played by Gert Frobe and his voice in the whole movie was dubbed.
The German actor’s accent was too strong and he spoke very poor english, so Michael Collins ended up voicing all of Goldfinger’s lines which were later added in post-production. Producers could have got in another actor with less of an accent but they thought his look worked well for the role.