Directed by: Amy Sherman-Palladino
Starring: Alex Borstein, Rachel Brosnahan, Michael Zegen, Marin Hinkle
Ethan... Esther... Chaim - S4-E7
Factual error: When Midge and Rose leave the club after the magicians act you can see tactile paving at the crossing. This can't be possible as tactile paving was first developed in Japan by Seiichi Miyake in 1965, so they're 3 years too early.
The Disappointment of the Dionne Quintuplets - S1-E4
Factual error: When Midge is moving to her parents' apartment there is a stack of books on the table while her son is watching TV. On top is a Nancy Drew book (the back of the book which is yellow). However publisher didn't introduce the editions with the yellow back covers until the 1960s.
How Do You Get to Carnegie Hall? - S4-E8
Lenny: What are you wearing?
Midge: I'm wearing my show corset.
Lenny: You have a show corset?
Midge: Yes.
Lenny: How is this different from, say, your dentist corset?
Midge: It's much more likely to suffocate me. It's also prettier.
Lenny: Yep. It's always the pretty ones who try to kill you.
Trivia: Jackie, the Gaslight manager, dies suddenly in Season 4. This was written into the plot due to the real-life death of Brian Tarantina, the actor who portrayed Jackie.