Christmas Special 1974 (a.k.a. A Perfect Christmas) - S8-E7
Corrected entry: When Harold finds his toy bus from his childhood as he puts it on the floor you can see the camera reflected in the windows.
Corrected entry: Harold's military service changed as the series went on. In the early black and white series, he fought in World War II, and in the later colour series, he did national service in the 1950s.
Correction: My father did both. Why couldn't Harold?
Christmas Special 1974 (a.k.a. A Perfect Christmas) - S8-E7
Corrected entry: In this episode it is revealed that Albert never knew who his father was, as it reads "unknown" for father's name on his birth certificate. But in previous episodes such as "A Winter's Tale", Albert mentions he has a sister in Stoke-on-Trent, and in "Oh What a Beautiful Mourning", Albert came from a family of 14 children.
Correction: None of that means that he has to know who his father is. If his mother was promiscuous, it's entirely plausible that he could live with her and his siblings but not know the identity of his father.
Correction: The reflection in the toy bus window is the dog shaped charity collection box seen earlier in this episode not the camera.