When Midge (Rachel Brosnahan) arrives at Sophie Lennon (Jane Lynch)'s home, her servants can be seen ironing the newspaper. This was a practice of the very rich and 5 star hotels, intended to dry the ink and keep it from making black smudges on the reader's fingers.
Abe Weissman (Tony Shalhoub) misidentifies Leni Riefenstahl's 1935 Triumph of the Will when referring to Miriam's old "ultra white" boyfriend Palmer Witherspoon looking like a "pole-vaulter from Triumph of the Will". Pole-vaulters were featured in Olympia Part One: Festival of the Nations (1938), Leni Riefenstahl's film about the 1936 Olympics.
When Rose (Marin Hinkle) goes to see her psychic, the new psychic is played by Katrina Lenk, who stared opposite Tony Shalhoub in the 2018 Tony Award Winning Musical "The Band's Visit," where they won Best Actress and Actor in a Musical, respectively.
There is a character named Dawes, who is the butler of character Sophie Lennon (Jane Lynch). This appears to be a nod to legendary voice-over actor Daws Butler.
David Paymer plays Sophie's high powered agent, Harry Drake. He was nominated for an Oscar for Best Supporting Actor for playing the brother and manager for Billy Crystal's anti-hero in "Mr. Saturday Night."