At the diner scene at the Gimli Slider, there's an ashtray with a lit cigarette on the table. Manitoba has had a smoking ban in all enclosed public spaces for over a decade.
This entire film was inspired by a podcast given by director Kevin Smith. Smith was emailed a copy of an ad placed on a Canadian website which he read during the cast, in which a man was searching for a lodger at his large home, and offered to allow one to stay for free on the condition that they dress in a "realistic walrus suit" for 1-2 hours a day. (As the man allegedly missed a walrus that he had befriended some years earlier.) While the ad ended up being a prank, Smith was so amused by the idea, that he immediately spit-balled a rough outline of a horror film that would eventually become "Tusk."