The Episode: Season 1, Episode 2 "Chestnut"
The Egg: In the 1973 film, Westworld wasn't the only world of hosts. In fact, there were three: Medieval World, Roman World, and of course, Westworld, with Delos as the company that ran all of the worlds. In Westworld, however, there just appears to be the one, but that hasn't stopped the show from peppering in some Delos references. Maybe we'll see the worlds expand as the series progresses.