Fan Nickname: The monsters are never directly named in-game (but are so in the game files) so a variety of nicknames sprung up. Grunts, the jawless ones, have gone by Mr. Face (or Mr. Flappyjaw) while Brutes, the metal-infested faceless ones have gone by Mr. Tall. Both "Mr. Face" and "Mr. Tall" were names given to them by Mangaminx. They have also been called "Mister Struts" and "Anti-Struts" respectively, by Spike and Barley.
While we're on that topic, Pewdiepie also refers to the grunts as "Bros".
The Grunt has also been nicknamed Mr. Flappyjaw, and the water monster has been called simply Sewer Monster (most likely because it reminded some of the Sewer monster in Silent Hill 3 ). The water monsters do have a proper name, but it's incredibly easy to miss and hard to spell or pronounce.note It's kaernk, if you were wondering.
No Budget: Would you believe that Frictional Games, the developers of Amnesia, had to work for no pay for a month or two? It's impressive that it turned out as well as it did, given their methods of motion-capping the monsters.
Talking to Himself: There are only two, somewhat minor examples. The first is Wilhelm and his companions in the Wine Cellar - all are voiced by Dan Zullo. The second is the dialogue between the girl Daniel murdered and her mother in the prison - both characters are voiced by Lani Minella.
Significant Double Casting: In Justine, the same voice actress does the voices of the silent protagonist and Justine, because they're both the same person.