Other mistake: At the beginning of the film, when Bond and the woman are getting into the Aston Martin, the roof and boot of the car are covered in dust, but the rear window is clean. (00:04:20)
Other mistake: During the sequence where Bond flees the baddies during the carnival, it becomes clear that the locals made their own outfits. For a few seconds, we see a group with headpieces that read "007" - so much for "secret" agent. To add a bit of humour to the moment, a dog can be seen urinating against the passing parade.
Other mistake: The tape recorder in Bond's room spins very fast, and the tape is not that big. It would have to have been started not long before Bond came back, and could not possibly have been running all day.
Other mistake: When the SEALs attack Largo's men, there is a scene where a SEAL swimming forward is shot with a spear gun. But the man simply doubles over; the harpoon - which should be visible protuding from his front - is not seen.
Chosen answer: Geiger counters show when radiation, even faint traces, are present. Therefore, if nuclear weapons were there recently, it will register. The scientist told Domino he threw the detonators overboard so the bombs could not explode. Also, nukes are surprisingly durable. Being in a large explosion will not detonate the core, only a specific chain reaction will.
SexyIrishLeprechaun