The movie is set in the early-to-mid 1970s. When the guys went to visit Windsor, Ontario, they stop at a Petro Canada Service station. Petro Canada did not exist until the late-'70s.
Miller Genuine Draft neon sign is seen in the window of a store as the two main characters are walking through town. MGD did not exist until 1985.
The Renaissance Centre (built in 1977) is visible, years before it was built.