The performance Charlotte and Carrie see at the museum was a reenactment of famed performance artist Marina Abramovic's piece entitled "The House with the Ocean View." The producers asked Abramovic to participate, but she elected to have someone else portray her in the episode.
Mikhail Baryshnikov plays a character with the first name Aleksandr. His real life daughter with Jessica Lange is named Aleksandra.
Miranda breaks the cookie cake in several pieces at 6:21 in but at 6:22 in the cookie appears just to be broken in half.
In Miranda's kitchen, Robert reaches for his pager/beeper before it goes off.