Victor yells on the phone to a company about an employee of theirs and refers to him as Frank Spencer. Richard Wilson guest starred in Wendy House (1978), in which he played an insurance man and famously sank through Frank Spencer's broken sofa, which was technically an outtake but was kept in by the BBC despite the actors obviously struggling to each keep a straight face.
Victor states he is 61.
Excluding comic relief specials, as Richard Wilson is the only actor to appear in this episode, this marks Annette Crosbie's only non-appearance in the series.
This episode marks one of the few times in the history of situation comedy that it was only the lead actor performing, where there were no other actors seen in the show, not even extras.
Uniquely, the episode doesn't open with the usual title sequence.