The recurring atmosphere player (blonde, middle-aged lady) is here hard to spot but she can be seen attending the masquerade party.
When David and McGee have their verbal exchange in the cloak room, David almost gives up his identity if McGee were paying attention. McGee says that the Hulk was responsible for the deaths of Elaina Marks and David Banner. David explains how Elaina died, but says nothing about Banner. McGee should have wondered why "John" didn't try to exonerate the Hulk of Banner's death as well.
The Equinox masquerade party in this episode is entirely based on Mardi Gras.
The episode aired on March 21 which is actually the Vernal Equinox or first day of Spring.