When the secretary plays back the reel-to-reel tape recorder for letters to type, we hear a voice, but the spools stay still
When Karl is loading the guns on the houseboat, a crew member with a torch is visible behind him at the end of the scene.
In the phone box, Steed calculates his gain. 29,000 shares at 11 shillings per share, which he works out is about £6,000. Actually it is £15,950.