In their list of examples of historical cancellations-before-airing, they missed one of the most baffling. "Heil Honey I'm Home!" was a 1990 British sitcom, stylistically parodying 1970s US sitcoms (over-the-top canned laughter, applause whenever characters enter the room, etc), about Adolf Hitler and Eva Braun as a suburban couple, along with their Jewish neighbours. Somehow, eight episodes of this were made (though not shown), and a pilot was actually _screened_, by a proper company (one of the predecessor companies to what's now Sky).
It's very difficult to understand how anyone thought this was a reasonable thing to make.
Oh, sure, this _can_ work (particularly as a throwaway joke, as in Bottom - "Any relation?" "Yes!"). However, in the case of the above show, it... didn't. The pilot's available on Youtube, or at least used to be. It is Not Good.
Hitler in sitcoms is a bit like brain surgery. When done carefully, judiciously, sparingly, by highly skilled professionals, it can work well, but the haphazard amateur approach is quite undesirable.
It's very difficult to understand how anyone thought this was a reasonable thing to make.