The final climactic scenes were filmed aboard the decommissioned Queen of Sidney, a 138-car ferry that served the British Columbia Ferry Corporation from 1960 to 2000. It now rests in the Silverdale Ferry Graveyard near Mission, BC.
When Will McKenna starts shooting the sea beast with his handgun there is no gun movement and you can clearly see that the gun didn't throw the bullets when he is shooting. And no flames are visible at the gun's barrel when he is shooting, you can only heat the sound of gunfire.
In the opening scenes as the boat is being whipped around by the sea there is no name on the top of the boat. As it pulls in and docks the name SARITA appears on the top of the boat.