The song playing when Midge Runs into Lenny Bruce at the airport sounds similar to the song he sings in season 2 episode 10 "All Alone", however it's actually an orchestral version of "Til There Was You".
Justine Lupe (Astrid) and Peter Friedman (George) also appear in Succession. Interestingly, their characters in Succession have similar roles to their Maisel counterparts. Astrid and Willa (Lupe) are married to the eldest siblings and George and Frank (Friedman) are executives.