Litmus

In the scene where the man is looking at the pictures on the refrigerator, in the glass cabinet next to him you can spot a reference to the Zombies mode in the Call of Duty video games. There are the original four Perk-A-Cola bottles; Juggernog, Sleight of Hand, Double Tap Root Beer, and Revive Soda, as well as another bottle that says Zombie Repellant. This is the second time Travis Darkow has hidden a reference to Call of Duty Zombies in his films, the first being a sign that read "Ascend From Darkness" in his film Goodbye Tomorrow (2019).

The owl, the deer, the seagulls and the swallows listed in the credits is an ongoing joke in a number of Travis Darkow's other films, where an animal or insect gets an "and introducing" credit. The names given to the animals are; Winston the Owl, Lucas the Deer, Wyatt and Jermaine the Seagulls, and Caroline and George the Swallows.