Supposedly the defense was hampered by noise against the Seahawks. Supposedly they didn't anticipate that the crowd would be that loud and it made it hard for them to communicate. Yesterday they used more non-verbal communication.
Now, IF that was the problem, then with Seattle... first: bad on the coaches for not understanding how crazy the fan base is and how much they want to cheer for a winner. But second: they obviously fixed the problem against the Falcons.