Spike's funny costume parodies Krushchev's famous shoe-banging incident at the UN. This actually took place on October 12th 1960 whereas the episode itself is set earlier in the year during summer.
Errol Flynn is referred to in the present tense (1960), despite dying the year before.
Clive states he never misses comedy series "Much-Binding-in-the-Marsh". The episode is set in 1960, whilst the radio show ran from 1944 to 1954. None of the few surviving editions were broadcast in 1960.