The black cars with fender-mounted mirrors in front of the hotel are Toyota Century (1997-2017). Century is considered the Japanese equivalent of Mercedes-Benz 600, Rolls-Royce Phantom, etc. and is used by the Imperial House of Japan, the Prime Minister of Japan, senior Japanese government leaders, and high-level executive businessmen.
Julian Richings's character Chet is named after the bellhop Chet played by Steve Buscemi in Barton Fink (1991).
The show's title card doesn't appear on screen until 21 minutes into the episode.
This is the last episode where Elliot Page is Vanya. All future episodes they are known as Viktor.