Dallas/WMG

Everything beginning with Pam Ewing waking up to see Bobby in the shower, including the two reunion movies, is just a dream.
There is no plausible way that Pam could have dreamed a full season of episodes in eight to nine hours of sleep. Also, she would have to have known that there was a mysterious woman stalking Bobby before the "dream season" began, and we saw no hint of that at the time.

But it is acceptable for everything seen by viewers since the end of the "dream season" to be the dream of a comatose person who has been unconscious since 1986. Perhaps someone shot J.R. and was successful.

This is supported by the fact that the dream revelation was ignored by the spinoff series Knots Landing.
 * Jamie and Sue Ellen were both in explosions just before Pam woke up from her 'dream'. Maybe it's one of them. It's most likely Sue Ellen because she was a major character. The scene with her explosion showed her walking into the room and then cut to an exterior shot of the window exploding...

J.R. Ewing wasn't really suicidal at the end of the series.
I don't buy J.R. as somebody who can be told what to do. Especially not by some figment of his imagination. But he was freaked out by his hallucination, and in the end took up violence against it by shooting the mirror instead of himself.