Continuity mistake: In the scene where Stromberg is thanking Dr. Bechman and Professor Marcovitz, he has a towel in his hand. When the camera changes to another angle that shows the back of his chair, his hands are totally empty and resting on an arm of the chair. Then it changes back to the original camera angle, and he now has a towel in his hands again.
Visible crew/equipment: The wires holding Jaws to the magnet are visible.
Continuity mistake: When Jaws holds the wooden stick at Bond, he holds it at an 11 o'clock angle. From the opposite shot, it's suddenly at a 9 o'clock angle - and this keeps switching back and forth.
Trivia: On Her Majesty's Secret Service features some of the series' best ski action, filmed by Willy Bogner Jr, who returned for three Roger Moore films starting with The Spy Who Loved Me. That film's legendary ski jump stunt was reportedly first suggested by George Lazenby during Majesty's, but the production lacked resources to attempt it. Producer Michael G. Wilson later credited a magazine photo of skier Rick Sylvester as the inspiration, though both accounts may be true.
Chosen answer: When the nuclear subs have been destroyed, there's an explosion in the control room, and one of the men cries out "Fuel tank!" Liparus has numerous internal fires raging after the battle with her crew. These uncontrolled fires eventually spread to her fuel tanks and ammo storages, one of which explodes in a huge fireball and finally causes Liparus to sink.
I thought the final explosions that sank the Liparus were deliberate self destruction after completing the mission in an attempt to destroy any evidence, rather like when Bolfeld manually triggers explosives after being thwarted in You Only Live Twice.
Liparus sinks slowly, and that would leave her crew plenty of time to evacuate. Angry and armed crew with a grudge against Stromberg.
Jukka Nurmi