Factual error: When Professor Dent tries to shoot Bond at Miss Taro's and Bond is waiting for him in the darkened room, the 'Walther PPK' that Bond is busily screwing the silencer onto, at the beginning of the scene, does not have an external hammer, and is therefore not a Walther at all. It's a Browning 1910 .32 calibre. (00:55:10 - 00:56:35)
Factual error: When Major Boothroyd gives Bond his new gun, he says that it is a Walther PPK but it actually is a Walther PP. It becomes a PPK in From Russia With Love (1963), the Bond film after this one.