Michael Palin's character is introduced at the start of the episode as Major Errol Phipps, however the gravestone at the end of the episode bears the inscription Major Edwin Phipps.
At the end of Escape from Stalag Luft 112B, Major Errol Phipps dies 3 months after the end of the war (WW1) which put his death as February 1919, but his gravestone says 1918.
Major Phipps (Michael Palin) is transported to Stalag 112B on 4th June 1917. However he is informed by Colonel Harcourt (John Phillips) that the next meeting of the Escape committee will be on 5th June; this is not in four months time as Phipps exclaims unless Phipps was in a coma for 8 months.