The title of this episode "The After Hours" was originally the title of a Twilight Zone episode #34 from season 1, 1960 written by Rod Serling. The episode, starring Anne Francis, revolves around a department store where the mannequins come to life one at a time and are allowed to go out into the real world for one month. This same episode of Twilight Zone is referenced in the scene where Ms. Cobel speaks to the security guard at the birthing retreat--their dialogue about a "Miss Marsha White looking for a gold thimble on the 9th floor, specialties department" mirrors Rod Serling's opening narration from "The After Hours."
When Helena Eagan has breakfast in front of her father in the intro, she is served an egg to eat with a silver fork. Normally you don't use actual silverware to eat eggs because a chemical reaction occurs that stains the silver and makes the food taste awful. In this kind of setting though, it was no doubt an intentional choice, tipping the mood from merely voyeuristic to mildly sadistic.
In episode 9, when Mr. Milchick and Mr. Drummond are having their confrontation in the hallway at Lumon, Mr. Milchick rephrases a sentence by saying "to put that monosyllabically, it's not my fault what Mark Scout does when he is not at work. It's yours". Every word after "monosyllabically" is, in fact, just one syllable.