Alternative Character Interpretation: There's quite a few for the Narrator in particular, as he behaves rather differently depending on Stanley's actions. Sometimes (as in the Confusion and Zendom endings), he seems to genuinely be on Stanley's side, while in others (like the Phone and Explosion endings) he acts as an antagonist, and in still others (like the Freedom or Insane endings), he has no direct interactions with Stanley at all and simply lives up to his namesake as the storyteller. It's rather telling that the narrator is at his most antagonistic when Stanley is either deliberately ignoring his directions (Phone ending) or trying to hijack the story (Explosion ending), while obeying the narrator generally results in favourable treatment. Is he an Omnipotent Jerk who delights in manipulating Stanley? A control-freak who cannot stand dissent? An creator who is trying to show off something he is excited about creating only to (potentially) be thwarted by an uncooperative partner who seems to be causing havoc For the Lulz? Such interpretation is largely left up to the player.
EIGHT!Explanation The demo of the 2013 HD remake features a button in place of the actual The Stanley Parable demo that has a red number eight painted on it and pressing it causes a voice to shout out "EIGHT!" while the number lights up on several tiny monitors behind it. The Narrator pleads with the player that this is not the actual game and demands him to leave the room, becoming increasingly desperate if the player remains and repeatedly presses the button.
OH, DID U GET THE BROOM CLOSET ENDING? THEB ROOM CLOSET ENDING WAS MY FAVRITE!1 XD Explanation If you spend enough time loitering in the broom closet, the Narrator asks if you're holding out for another ending, and says there isn't one. He then snarks that you're probably stupid enough to think waiting in the closet is the ending, and you'll go on the internet afterwards and say "OH, DID U GET THE BROOM CLOSET ENDING? THEB ROOM CLOSET ENDING WAS MY FAVRITE!1 XD" He doesn't say "XD" out loud, or any of the intentional misspellings though, those just appear in the subtitles.
Moral Event Horizon: The Narrator definitely crosses it in the pawn ending, where he railroads Stanley into a nightmarishly depressing, psychologically abusive power trip. It starts with him tempting Stanley with the chance to see his loving wife, only to tell him that he has no wife, and that nobody loves him, and then it just keeps getting worse from there.
Most Annoying Sound: To get the Art ending, you have to play a game where you save a cardboard cutout of a baby from crawling into a fire. A loudly, constantly crying baby. That would be bad enough, but the way you do this is by pressing a button every few seconds, and when you do it makes a sound like electronic flatulence. Halfway through, the Narrator adds a barking puppy being lowered into a tank of piranhas to be saved with a different button and different sound, just in case you were using an auto-click tool. And this lasts for four hours. It's almost literally torture.
The Tape Knew You Would Say That: Judging by approximately 100% of Let's Plays of this game, the Narrator completely has the player's number in the Countdown ending.
Narrator: Did you just assume when you saw that timer that something in this room was capable of turning it off? I mean look at you, running from button to button, screen to screen, clicking on every little thing in this room! These numbered buttons! No! These colored ones! Or maybe this big, red button! Or this door! Everything! Anything! Something here will save me! Why would you think that, Stanley?
That One Achievement: The HD version goes to town on parodying this. The top three "impossible" achievements require you to spend an entire Tuesday playing the game, to not play the game for five years, and the final one is completely impossible to get. The first two can be acquired by adjusting your computer's date and time settings, the third seems to be handed out at random, if YouTube evidence is to be believednote ...or you can use this guide to cheat your way to it.
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.