In "Hypothesis" the jock character is dressed like Johnny Depp's character in A Nightmare on Elm Street.
The Greek letters on the Devil's Lake Impaler sweater are Delta, Epsilon, Alpha, Theta. aka DEATH.
According to a tweet by the director, the two piranhas in the background of the fish tank died before shooting, so they are being puppetteer-ed by two crew members with a string during the shot.
The time on the clock behind them when they first introduce the "stoner" character played by Chase Williamson is 4:20; the stoner code.
The map shown in the last segment, Horror Hypothesis has multiple horror nods. They include: The Cenobite Cafe (Hellraiser), Last Records Room on the Left (Last House on the Left), Server Room 237 (Shining), Outpost 31 (The Thing), V/H/S archives (V/H/S), Delta 88 (Evil Dead), Also Herbert Wests name is on the screen to (Reanimator series)