In the 'Little Sir Echo' sequence in the lounge, Dame Flora falls back in her chair dead. Throughout the film her expression changes.
(15:23) Mackay presents Kathy with his card, and snaps his wet umbrella shut. As the shot switches to the interior, Kathy's entire body has changed position and she's no longer perusing the card.
It is clearly stated that the action is set in 1946, but there are numerous contemporary (1980s) references, particularly from Eric Morecambe.
A poster reveals Eric and Ernie's new revue "Fools Rush In" opened at Her Majesty's Theatre, Carlisle, on Monday 23rd September 1946. Following the death of Queen Victoria in 1901, Great Britain did not have another female monarch until the accession of Queen Elizabeth II in1952 - at this point her father King George VI reigned (his initials are seen on the Black Maria in the closing sequence).