Continuity mistake: After Mike punches Gurty, the right ear flap of Gurty's hat is covered in snow in the front shots, but clear in the shots from behind - alternating between the two throughout the scene.
Other mistake: Liam Neeson jumps into ice water to rescue his brother. He then painfully pulls his brother into the cab of the truck. Inside, he revives his brother after which they have a lengthy conversation. Liam's Mike McCann never starts the truck engine or turns the heater up, even though he and his brother are soaked to the skin and the brother is coughing up ice water from his lungs. In the next scene, both appear dry, in the same clothing, with no signs of hypothermia.
