When Clive first visits his Aunt's house and the camera pans to the wall where the animal heads will appear, a lighter patch of wallpaper can be seen where one of the heads is later superimposed.
When Angela is playing darts, in the closeup, it is seen that two of her shots landed at the edge of the board. When she goes to retrieve them, however, she takes all three darts from the center.
When, in 1919, Candy receives the letter telling him of the whereabouts of prisoner-of-war Schuldorff, there's a shot of the letter saying that the camp is called 'Hardleigh'. However, in voice-over, Candy says 'Hardwick'.
The notice Candy places in The Times about Murdoch's death states that he died in a bombing raid in October, 1940, but when Candy is shown on the cover of Picture Post magazine sometime afterward, the magazine is dated September 21, 1940.
Candy's scar is clearly visible on his upper lip when he is in his room at the convalescent hospital, but it is obscured by his newly grown mustache moments later when he goes to congratulate Kretschmar-Schuldorff.
Clive Candy goes to confront Kaunitz in Berlin, which is in Prussia, but Kaunitz's Stammtisch (regular table for meeting of friends) are drinking from Hofbräuhaus krugs (steins), noted by the 'HB' insignia. The Hofbräuhaus is in Munich, which is the capital of Bavaria, 360 miles away.
No one seems to question the title "The Life and Death of Colonel Blimp" even though the eponymous character does not die, and is very much alive and the story's end.
A camera shadow is visible on Clive's shoulder when he meets Theo at the Alien's Hearing.
A camera shadow is visible on Clive's back as he approaches Theo at the prisoner camp.
When the two dogs are let into the London house, one can be seen at the top of the stairs answering a call of nature.
In the WW1 scene where Candy receives a message from a motorcycle despatch rider, the man is wearing the blue and white signaller's armband upside down.