The Stanley Parable/YMMV


 * Good Bad Bugs: The black "monolith" that initially appeared in during the Essence of Divine Art's message (which several people thought was a Shout-Out to the monolith in 2001: A Space Odyssey) is actually the puppy's door in the Baby Game not disappearing properly. When it was finally patched three years later since it covered some of the text, many players were surprised, thinking the "monolith" was the Divine Art.
 * Unwinnable by Insanity:
 * Happens in the original mod if you get off of the elevator between the time when you push the button and when the elevator doors close.
 * You can get stuck in the Portal room, just like the Portal game. Unlike in Portal, the Narrator chastises you for doing so, making it also (a rare case of) Unwinnable by Design.
 * During the "Real Person" ending, you can jump out of the moving platform before the door closes, at which point there's no way to continue the story... one of the few rare cases of when Developers' Foresight does not apply. You do get a chance to closely examine the ground level of the storage room though, since the fall doesn't kill you this time.
 * In the monitor room in the HD Remix, it's possible to step onto one of the desks and jump off into the abyss. The game has no programmed response for that, and you simply stand at the bottom with no way out.