Malcolm Barrett plays Morgan, a friend of Ron (Jonathan Slavin). Barrett and Slavin previously played best friends and colleagues on Better Off Ted (2009) (also created by Victor Fresco).
Eric describes the "Murder Hole" as needing to be four cubits deep. This can mean what is typically regarded as the standard cubit which is 18 inches equaling 72 inches deep, or six feet. The "long cubit" would be 21 inches equaling 84 inches deep for the "Murder Hole", or seven feet.
Malcolm Barrett (Morgan) and Goran Visnjic (Dobrivoje Poplovic) starred together in the NBC show Timeless, as Rufus Carlin and Garcia Flynn.