Ben Barnes (Logan) broke his foot before arriving to the first day of shooting. Being afraid of losing the job, he didn't tell anyone, and just used the limp to look like a character choice. He then had to maintain the limp throughout filming.
The quote "These violent delights have violent ends" is from Shakespeare's Romeo and Juliet.
The modern songs heard on the player piano in the Mariposa Saloon and Hotel are the idea of writer, producer, and director Jonathan Nolan. Nolan and composer Ramin Djawadi explained that the covers are to remind people that the world is a theme park, and that everything is scripted. The songs are chosen by Nolan.
Writer, producer, and director Jonathan Nolan describes this show as "the next chapter of the human story, in which we stop being protagonists."
Background actors and extras for some scenes were required to sign contracts which included the following note on on-screen nudity: "This document serves to inform you that this project will require you to be fully nude and/or witness others fully nude and participate in graphic sexual situations. By accepting this Project assignment, you may be required to do any of the following: appear fully nude; wear a pubic hair patch; perform genital-to-genital touching; have your genitals painted; simulate oral sex with hand-to-genital touching; contort to form a table-like shape while being fully nude; pose on all fours while others who are fully nude ride on your back; ride on someone's back while you are both fully nude; and other assorted acts the Project may require." They were also paid around $600 a day; over four times what they may receive for appearing in a more typical, clothed crowd scene.