- Actor Allusion: Brynner wears the same outfit from The Magnificent Seven.
- Recycled IN SPACE!: 15 years later, Michael Crichton would write his most famous story, Jurassic Park, which is also about an amusement park where the attractions go crazy and attack the guests (only this time they were cloned dinosaurs, not robots).
- Technology Marches On: The sheer number of reel-to-reel computers running the resort are one obvious case. Another is that the spreading malfunction of the Delos robots is described in terms of an infection, which the heads of Delos laugh off — keep in mind that this came out two years after what is commonly described as the first computer virus, and almost a decade before the first time one infected anything outside of the lab where it was created.
- What Could Have Been: Quentin Tarantino was offered the chance to helm a remake of the film in the early 2000s but declined, and the film eventually got lost in Development Hell.
- The Character Died with Him: Indicated to be so with Kissy, since Eddie Rouse passed away in December 2014, a few months after filming the pilot. A dedication to him appears in the pilot episode's end credits.
- Production Posse: Several of the crew members are people who've worked with Nolan on his former projects. From Person of Interest: directors Richard J. Lewis, Fred Toye, & Stephen Williams; actors Jimmi Simpson & Steven Ogg, writer Dan Dietz, composer Ramin Djawadi, editor Stephen Semel, & visual effects supervisor Jay Worth. From The Prestige, Interstellar, & The Dark Knight Trilogy: production designer Nathan Crowley, & set decorator Julie Ochipinti.
- One of the first lines of the pilot, is 'Can You Hear Me?', said by a human to a host. It often happens to be the opening words of another AI when starting conversations with humans on a certain other show also created by Jonathan Nolan.
- In "The Stray", the woodcutter is shown to have a programmed hobby of woodcarving. Two of the carvings, one of a bear and another of a turtle, have etching of the constellation Orion on them. The bear and the turtle are major symbols in The Dark Tower by Stephen King, where they serve as metaphorical and literal guardians of one of the eponymous Tower's six beams. Considering that one of the show's creators previously worked on trying to get the film adaptation of the series out of Development Hell, it's not a stretch to say the symbolism was deliberate, especially considering how similar Westworld is to The Dark Tower in setting and themes.
- What Could Have Been:
- Eion Bailey was originally cast as Logan but had to drop out, and was replaced with Ben Barnes.
- Actress Miranda Otto had to leave after filming the pilot due to commitments to Homeland, and so she was replaced by and her scenes refilmed with Sidse Babett Knudsen.
- George R.R. Martin himself suggested that the series also include the film's Medieval World, allowing for a few cameos from Game of Thrones. Amusingly, the producers' explanation for why they didn't take him up on it is that it would mean admitting that dragons aren't real.
- According to Nolan, there was a long arc envisioned involving Kissy, but it was scrapped when Rouse died after filming the pilot.