In this episode Mr Grainger said he has worked at Grace Brothers for 37 years, yet in episode Up Captain Peacock (1975) he said he has been there for 35 years.
Rumbold's office has a cabinet installed next to the door to house the cuckoo clock, which was not there in previous- or following- episodes.
The first time Mr Mash demonstrates the Pussy Boots display the audio continues long after he switches it off.