Pronoun replacement: The game stores the last noun used in the text parser and can be replaced by any pronoun; best one to use is it. Example: unlock door, open it.

Noun stacking: The game only recognizes the last noun put into the parser. You can hit space or F3 and type another noun after the first and the game will recognize that one which saves having to type out the verb. Example: get nut, get nut stones.