The Brides of Fu Manchu

Christopher Lee is Fu Manchu and kidnaps the daughters of leading scientists in the Edwardian era in order to build a wireless transmitter that transmit power waves. He then hypnotises the women into submission (why not the scientists).

In one scene, what is clearly a pre-heterodyne wireless set he sends a message to his adversary, but then in the next scene behind it is a record player when he shows the message to his colleagues, like they changed the script halfway through.

There's also a scene where an actor turns off a noisy tap halfway through a telephone call, a car is shown whole after it has been crashed, a police constable that slips and slides on the road but recovers, a painful looking stage dive during a melee, and a flighty horse that looks like its about to run away.