Actor BD Wong, who doesn't appear in the episode, wrote on Twitter that this episode was special in the table reads: every actor that was not in the episode was asked to leave the room.
The episode was aired without commercials, and was relatively longer (an hour).
The only books visible (whose titles are displayed by their spines) in the entire episode are all authored by "Freud". Sigmund Freud originated the concepts of the id, the ego, and the superego: "three separate but interacting parts of the human personality that work together to contribute to an individual's behavior". This seems poignantly relevant to this episode's context on Elliot's psychological perspective.
This episode was in a different format. While a lot of television scripts are divided to 5 acts, it's only in the script itself and a lot of the time means that after each act there's a commercial break (in network TV). This episode, that was aired with no commercial breaks, clearly introduces them in cards ("ACT ONE," "ACT TWO," etc.). It signifies the acts as plot keys for the episode.
The sets for Krista's apartment are much larger than the previous episodes to obtain the look of a stage play.