The fake NBC show "Gals on the Town" is once again featured on the final season of "Unbreakable Kimmy Schmidt"
The last line where Jack says he will find some Canadian that will take his money is cut short by the Executive Producer credit. The in-joke is a nod to Canadian Lorne Michaels who will presumably take people's money.
The flight attendant, "Stewart" is played by Jeff Hiller, who also played a hotel clerk in episode 305, "Reunion".
Liz's boyfriend Carol's last name is Burnett.