was a major hit for the when it premiered in 1968 and ran for nine series including the pivotal moment TV switched from black and white to colour.
The sitcom gained millions of fans who tuned in to watch the doings of the United Kingdom’s Home Guard during the Second World War.
It followed the farcical exploits of the Walmington-on-Sea platoon, led by Captain Mainwaring (played by Arthur Lowe) until its final episode in 1977.
Throughout the series, there was a key moment at the end of each episode and just before the credits rolled, when the phrase “You have been watching” flashed.
However, one episode from series four concludes abruptly and rolls straight to the credits in an unusual shake-up.
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Dad’s Army aired its final episode in 1977 (Image: BBC)
Series four, episode seven titled Put That Lights Out, saw the hilarious moment Jones, Fraser, Godfrey and Pike got trapped in the lighthouse tower at night and accidentally illuminated the entire town for enemy bombers.
However, in an unusual twist, the episode abruptly ended and went straight to the credits without its key phrase.
This change didn’t go unnoticed as some fans took to a to discuss the change.
A viewer questioned: “I wonder if anyone can shed any light (no pun intended) on the Episode ‘Put That Light Out’ from Series 4 not having the normal ‘You Have Been Watching’ at the end missing? Has the end been cut for some reason?”
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The Dad’s Army episode was missing its usual phrase (Image: BBC)
In response, another fan suggested that Harold Snoad “directed Put That Light Out, whereas David Croft normally directed the episodes.
“Put That Light Out is possibly just suffering from being prepared for transmission by Harold, who only directed a handful of the 80 episodes, and was not as familiar as David Croft with how the episodes were normally formatted for broadcast.”
They added: “It is entirely possible that Harold Snoad’s relative inexperience with directing the show led to him overlooking the ‘You have been watching…’ credit.”