On the cover with Borgnine, why is that guy with the beard wearing a futuristic traffic cone on his head?
You've never seen The Black Hole, have you? "That guy with the beard" is Maximilian Schell as Dr. Hans Reinhardt, the film's villain, and the "traffic cone" is the head of his menacing robot enforcer, named Maximilian in the actor's honor, standing behind him.
https://en.wikipedia.org/wiki/The_Black_Hole_(1979_film)
Also depicted on the cover from left to right: Joseph Bottoms, Ernest Borgnine, Robert Forster, Yvette Mimieux, and Anthony Perkins.