^ And it could be argued that the heaven and hell scenes actually were only being imagined
by Kate McCrae in the first place, since right before we see them, there's a closeup on her eye (and as we see Dr. Reinhardt in hell, we hear Kate say "Murderer!").
As for the remake: Obviously they're going to have to change the name, because we now know that it's not possible to fall into a black hole and live. Wormhole
That being said, I find it hilarious - and almost certainly planned - that an actor named Maximilan Schell plays a character who, at the end, ends up...in Maximilian's shell.