Well, I once played Might and Magic VI with Voland, and both of my teleportation spells in the dungeon were non-functional, meaning I had killed my own companion, and there was absolutely nothing else to do... a real pain. I noticed that in such cases, in Might and Magic VII, it's easy to detect a Dimension Door or Fly spell, as the chances remain.
What's even more amusing are maps with a path like "Around the World in 80 Days." That is, a narrow path leading around the perimeter of the entire map, right along the edge of the frame. In my last game with Aiwe, that's exactly what happened.