Opens with the quote, "And branded upon the beast, the mark of his kin. For none shall live whom they have seen.". This is the first opening quote not from any pre-published work, but rather from something within the mythology of the show; it is from one of the "Wesen cautionary tales" Monroe reads in the episode (the fairytales the fairytales tell their kids).
Bud's last name is revealed to be Wurstner.
When the symbol is shown on the news, the channel shown is a reference to the real KGW channel 8 news in Portland, OR.
During Captain Renard's first press conference, the Mayor of Portland speaks a few words to the reporters. The Mayor is played by the (at the time) real Mayor of Portland, Sam Adams. His own real name is listed on the chyron at the bottom of the screen.
The storage unit number that Donna Reynolds was being held in was 210, a reference to the episode number.