Revealing mistake: "Q" says Bond has to activate the homing device by pressing it, but he doesn't press it, he pulls it back.
Revealing mistake: In Fort Knox, after Oddjob cuts the cables with his hat, he and Bond fight and Bond smashes a metal bar against him. Sean Connery's stunt double is very noticeable because of his longer and bulkier hair.
Revealing mistake: Bond drives his Austin Martin into a wall because he believes that the headlights appearing before him belong to another car (actually, they were the reflection of his own lights). When he first sees the lights, they are directly in front of him, but only just before the crash, the angle of the reflection changes. And the way the mirror was hung up when Oddjob looks at it, it was in no position to reflect the light the way Bond sees them.
Answer: Security and guest privacy was less of a concern in this era. Often someone could merely inquire at the desk which room a guest was staying in. Another ploy often used in movies was to leave a note for the guest and then watch which numbered mailbox the concierge placed it in.
raywest ★