The last episode that Hyde has a beard.
Charlie McDaniel (Re-recording Mixer), Craig Porter (Re-recording Mixer), and Vince Rohr (Production Sound Mixer) were nominated for an Emmy in the category of "Outstanding Multi-Camera Sound Mixing for a Series or Special" for their work on episodes 5 through 10 of this season.
The episode title is also the title of a track on Led Zeppelin IV, released in 1971. Several other episodes are also named for songs on this album, including "Going to California", "Battle of Evermore", and "Misty Mountain Hop".