Good movie with the minor quibble that the main actor didn’t actually act. Micheal Ironside and Patrick McGoohan acted laps around Stephan Lack, and McGoohan was drunk off his face the entire time.
Also, the actor who played the dude with the exploding head, Louis Del Grande, starred in a Canadian show called Seeing Things. The premise was the guy solved mysteries with his psychic powers.
And another thing, the exploding head was done with super high tech special effects: a shotgun to the dummy’s gore filled head.