The American flag in front of the store has 48 stars.
Books From Beyond's address is 1973 Olds Road. Ash's car is a 1973 Oldsmobile (Delta 88), the same car as in Evil Dead II (1987) and Army of Darkness (1992).
The title of the episode, El Jefe, translates to "The Chief" or "The Boss."
The episode closes with Ash's famous quote, "Groovy."