When Midge goes to the back room at the gallery, she asks the artist how much for a piece of art. The artist says $25, yet Midge only lays down one bill. On the next shot, you can barely see another bill under the $20.
A Japanese woman says "nice ladder" in the art gallery. This is supposed to be John Lennon's future wife Yoko Ono. But Ono was married and living in Japan at the time and had left NY in 1956.