Zachary Levi's directorial debut.
One of the weapons on display in the dojo in Castle is a Klingon Bat'leth.
The Buy More employees parody the famous Joe Rosenthal photograph of US Marines raising the American Flag on top of Mount Suribachi, on the island of Iwo Jima, during World War II.
This episode was chosen for a Zoom table read in support of the Feeding America charity in response to the COVID pandemic. The entire cast including episode guests participated. A video of this event can be found on YouTube.
Jeff has "contraband" in his locker, he uses it to take the edge off. The chemical bottle is labeled 'alkoxyalkane'. This is an entire class of organic chemicals ranging fron highly volatile ether (which has been used as a recreational drug since the Victorian era) to stuff like paraffin.