I got it and it's now not necessary but good to know for the future. ;-)

Flack's sister is Heather the Werewolf! It took me about halfway through the episode to figure that out. Pretty good casting, she's quite similar looking in the eyes/nose area. It's nice to see some backstory for him! I hope we see more, soon.

It's nice to see Adam get a little more screen time too, I've always loved him.