The Prisoner takes the cake for vague show endings. Probably because so little of the show made sense in the first place, there’s real hope going into the last episode that at least something will be explained, instead not only are none of the primary questions going into the last episode explained the last episode goes out of it’s way to raise MORE questions (the biggest of course being “what the hell did I just watch”). And it’s amazing to me how steadfast McGoohan has remained in refusing to explain anything about the show, of course by this point he’s probably to senile to remember the answers that were only in his head. But he’s been very dedicated to providing only vague answers to every question about the plot of The Prisoner, while actually being pretty open and thurough in discussing the creation of the show.
Coronet Blue takes the cake for vague show endings. I’m still pissed it was taken off the air before I figured out what it was about.