In the dinner scene, Ed Harding piles an overly large pile of mashed potatoes on his plate, and then seems to toy with them with his fork. This is almost an homage to a key scene in Close Encounters, where Richard Dreyfus sculps Devil's Tower with his mashed potatoes.
When the Sheriff comes into the museum to talk to Max, Max is putting up a sign that says "Trust No One", which is a key theme, and on a prominent poster in that series.