Near the beginning of the film a moving truck can be seen with the name Romero & Sons. A reference to George A. Romero who is the father of zombie movies.
Anton Yelchin (Max) is now buried in the Hollywood Forever Cemetary shown in this film. Yelchin was killed in 2016 after freak accident in which his SUV pinned him against a brick pillar attached to a security gate at his home.
A little Dante in-joke: The goth bartender (Mark Alan) is actually a reprisal of the character "Mortis" from Roger Corman's Netflix series "Splatter" also directed by Joe Dante. Costume, makeup and even Alan's hair are all the same.
The character name "Evelyn" is most likely a nod to the 1971 Italian horror film "The Night Evelyn Came Out of Her Grave" directed by Emilio Miraglia.
When Max and Evelyn are having sex at the beginning of the film, the movie Fright Night (1985) is playing on the TV. Anton Yelchin played the lead role in the 2011 remake, Fright Night (2011).
Joe Dante: [Dick Miller] Dick Miller, who has appeared in all of Joe Dante's films, makes a cameo as the Grumpy Cop.