On the way to her blind date, Maya tells Christina "art is a lie that tells the truth". This is a common paraphrase of painter Pablo Picasso, who actually said "We all know that Art is not truth. Art is a lie that makes us realize truth at least the truth that is given us to understand. The artist must know the manner whereby to convince others of the truthfulness of his lies."
The bedtime book Caleb reads to Frankie is 'My Father's Dragon' by Ruth Stiles Gannett.
An orchestral cover version of the song Video Games written by Lana Del Rey (Elizabeth Grant) was played at the end of Westworld season 4 episode 1, The Auguries. This version was composed by Ramin Djawadi.
At 33-34 minutes Christina sees the fallen potted plant on her balcony. There is the original "maze" design drawn in sand next to the plant.