Many people over many years were responsible for the development of traffic lights - which were Red for stop and Green for go until the Yellow warning signal was invented by (not a Lunatic but) Detroit policeman William Potts in 1920.
Josh mentions that he has his nephew's Bar Mitzvah, hinting that the character of Josh is Jewish. Eliot then replies with, 'Mazel', the shortened phrase of 'Mazel Tov', meaning congratulations. Trevor Einhorn, who plays Josh is Jewish, with Hale Appleman, who plays Eliot, being half-Jewish on his father's side.
When Natasha demanded a shade as payment, the look on Julia's & Alice's faces showed how much they still remember the experience of losing their shades.
Julia knew that Eliot was lying about him forgetting everything that happened while possessed by The Monster, since she was possessed by its sister.