"There were many things that happened that people would've been so happy to happen — attacks of direwolves and crazy stuff," Sapochnik said. "At a certain point you're, like, '50 direwolves attacking an undead dragon does not a good movie make.' This was stuff we did not shoot; it's part of the process."
Clearly, Sapochnik underestimated what Game of Thrones fans would be excited to see. A pack of direwolves attacking an undead dragon sounds like the coolest thing ever.