Factual error: The pre-titles sequence makes reference to "the long hot summer of '71". Yet the trees that are visible in this scene are bare - which betrays the fact that this episode was, in fact, filmed in the winter (November 1977 to be exact).
Factual error: The assassination attempt takes place on Wimbledon Finals Day, yet there seem to be other matches going on at the same time, which doesn't happen when the final's occurring.
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