Alright, this ep is definitely the first that I'm willing to admit.... this is DEFINITELY two separate timelines going. Not sure William is the Man in Black, but I'm sure his timeline is leading to "the incident of 30 years ago".
As secretive as this show is, the most blatant thing is the logo change. Old logo is exclusively in William's timeline, the new logo is in the Bernard one.
View media item 2223849
This article has a pretty dope breakdown of the logo thing:
https://www.inverse.com/article/23301-westworld-two-timelines-logo
I also think that Anthony Hopkins is a host. Not only did it turn out his picture of with with "Arnold" was really him and his host-dad, but when Bernard is searching for anomalies, the system notes that there are 5.... he get's to the house, and there are only 4 'people' present... and then Ford/ Anthony Hopkins walks in. "A great artists always hides himself in his work"
Finally, pretty sure Arnold decided that humans were too destructive and he wants his creations to take over. Hence, him directing Little Ford for kill the dog as a microcosm of that.