An episode is kept on standby by the BBC for use as an emergency back-up program, to be broadcast if a major technical problem prevents normal programs being shown. This came to light on June 20, 2000 when the Six O'Clock News (1984) was interrupted by a power failure at the BBC, and an episode of this show was transmitted in its place.
Despite always referring to Sergeant Wilson as Uncle Arthur, it was finally confirmed that Private Pike is the biological son of Sergeant Wilson, when, on the very last day of filming, Ian Lavender asked co-writer and producer, David Croft, "Is he (Sgt.Wilson) my father?" To which Croft replied, "Of course he is! "
During the final season, Arthur Lowe was ill with narcolepsy, John Le Mesurier had cirrhosis of the liver, and John Laurie was ill with emphysema and memory problems.
Following the death of Edward Sinclair, Arthur Lowe said there would be no more "Dad's Army". However, the final episode was clearly intended to be the last anyway.
When an episode of the show was shown to members of the public to gauge audience reaction prior to broadcast of the first season, the majority thought it was very poor. The production team put the report containing the negative comments at the bottom of David Croft's in-tray. He only saw it several months later, after the series had been broadcast to great acclaim.