At around 6 mins, Kelso opens a bottle of soda with a kitchen knife. As he sets the knife down, the blade is pointing toward him. When he lets go and moves his hand away, the blade is gone.
In previous seasons, it is a point that Hyde's El Camino has a manual transmission. However, when Fez steps on the gas, the sound is of an automatic accelerating.
A poster for Meat Loaf's album, "Dead Ringer", can be seen on the wall of the record shop, but that album wasn't released until 1981.
Fez tells Kelso that the apartment isn't available because the landlord, "Orlando", says no parties are allowed. The landlord's name is Fenton.