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)
Suggested correction: Correct to say it's not a PPK, but it's not a Browning either - in a close up one can see the Beretta logo on the grip.
First off, it is certainly not a Beretta. That's not the Beretta logo (3 arrows), but it's the Fabrique Nationale logo (stylized FN). Plus the Beretta has an external hammer and the gun in question does not. It is indeed a Browning 1910 (which is manufactured by Fabrique Nationale. Finally, it is not necessary to submit a correction for mistakes that are accurate but have one or two words wrong (not that this mistake had any words wrong).
Factual error: Bond is worried that Dr. No has picked up the sails of Honey's boat on his radar, as indeed the good doctor has (in the movie), but radar systems cannot detect cloth or a wooden mast. (01:01:40)
Suggested correction: Depending on the quality and power of the radar set, wood ships can be detected. A military warship radar, even in the early 1960s, could detect a wood sailboat.
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. (00:13:10)
Factual error: When Bond and Honey are machine-gunned from the boat it is a Bren gun, but the magazine appears to be the wrong way round and faces backwards.