At the start, the elevator appears to be stuck between floors. Then, when Mr. Spooner and Miss Brahms get off the elevator, it is apparently still moving, as the dial indicates they are approaching the fourth floor. Except the departments they work in are on the first floor.
Mr Humphries blamed Mr Spooner when he was using the police frequency, but Mr Humphries is the one who set the controls. Mr Spooner only touched the microphone, not the settings.
Mr Humphries' operation of the reel-to-reel tape recorder is erratic to say the least, missing the start of some scenes and at one point banging the 'stop' button down on a clearly non-moving tape.