Nyla's surveillance of her neighbors is reminiscent of James Stewart performance in Rear Window (1954), a mystery film in which an incapacitated man witnesses unbecoming conduct from afar and tries to get the bottom of things. Instead of a wheelchair, Nyla is hampered by her pregnancy.
The thrash metal song Harper's neighbor is listening to is C.A.N.C.E.R by Architects
When they show a close up of Aaron's foot on the gas pedal, it is his left foot not his right foot.
When Carbon Monoxide kills a person, their skin turns a distinct shade of pink. If they die before the exhaust is turned on, they retain their natural color.