David Sobolov, who voices Grodd, was reportedly made fun of for "looking like a gorilla" when in school.
This episode was nominated for a Primetime Emmy for Outstanding Special Effect.
During the episode Cisco references 'R.O.U.S.' in relation to going down into the sewers and muses if any of them actually watch films. The acronym refers to Rodents Of Unusual Size, a creature from The Princess Bride.
In a deleted scene, Caitlin revealed that Mark Mardon always ordered Thai food whilst incarcerated in the Pipeline.