David Harewood becomes the first member of the main cast to direct an episode.
Lena mentions that Lex was a huge fan of Oscar Wilde. Chyler Leigh's (Alex) husband, Nathan West, is also a huge fan, and Wilde is their son Noah's middle name.
In her interview with Kara, Dreamer self-identifies as an "INFP". This is a Briggs-Meyers personality designation for Introverted, iNtuitive, Feeling, Perceiving.
In the prelude Brainy provides support from a van to Dreamer, much as Winn supported the Guardian.
First episode in which Melissa Benoist only appears as Kara Danvers, and no sign of Supergirl in her outfit, except momentarily in the recap at the start. No flying done. Kara does display superhuman office skills, and did stop a pickpocket with her alien strength, though. Actual confrontational fighting is equally shared with Dreamer. Kara's freeze-breath does come into play.