In the Westworld season one episode, Chestnut, Dr. Ford says the following to the host child Ford,
"Everything in this world is magic, except to the magician." - Dr. Ford, Chesnut
In 2001, Jonathan Nolan had been tasked by his brother, Christopher Nolan, to begin to co-write the script for the adaptation of the novel, The Prestige , which was released as a film in 2006.
A year later, the option on the book became available and was purchased by Aaron Ryder of Newmarket Films. In late 2001, Nolan became busy with the post-production of Insomnia, and asked his brother Jonathan to help work on the script. The writing process was a long collaboration between the Nolan brothers, occurring intermittently over a period of five years. In the script, the Nolans emphasized the magic of the story through the dramatic narrative, playing down the visual depiction of stage magic.
The Prestige is psychological thriller & science-fiction film about a rivalry between seemingly two magicians, when they have a falling out due events happening at the beginning of the film. One famous line of dialogue of the film coming from the magician Alfred Borden is,
"Are you watching closely?"
And perhaps the opening cutter,
Every great magic trick consists of three parts or acts. The first part is called "The Pledge". The magician shows you something ordinary: a deck of cards, a bird or a man. He shows you this object. Perhaps he asks you to inspect it to see if it is indeed real, unaltered, normal. But of course...it probably isn't. The second act is called "The Turn". The magician takes the ordinary something and makes it do something extraordinary. Now you're looking for the secret... but you won't find it, because of course you're not really looking. You don't really want to know. You want to be fooled. But you wouldn't clap yet. Because making something disappear isn't enough; you have to bring it back. That's why every magic trick has a third act, the hardest part, the part we call "The Prestige".
The two works, The Prestige and Westworld have many things in common including a back story with Dr. Robert Ford and Arnold Weber that may resemble that of Alfred Borden and Robert Angier, being sorts of rivals. Major plot twists. Both come to deal with a science-fiction premise that complicates the notions of real or identity. (Granted The Prestige doesn't get into it's science fiction elements more directly until it's final act). Or even something like Juliet's suicide is reminiscent to Sarah's, as both didn't always feel truly loved by their husbands and accused them of occasionally being phony.
At any rate, given that Jonathan Nolan is an executive producer and writer on Westworld, was this line of dialogue meant to reference The Prestige?