This is set in Whitehorse, Yukon Territory, Canada. A US 'forestry service' vehicle would not be present in the search. The northwestern-most tip of the continental US, Seattle (from which the plane took off) to Whitehorse is over 1,400 miles.
The FBI would not have jurisdiction for a search for a missing persons in the Yukon Territory of Canada.
At the end of the film, the vehicle present does not have a Yukon Territory license plate.
For such a low0profile case, the FBI would not be arresting a US citizen in a Canadian territory or province.
The US Foresty pickup truck seen early in the search has Manitoba license plates.
Ranger Strickland tells her party that they are in Inuit Indian land. This is a Canadian film, set in Canada, but clearly aimed at US audiences. The only US state with Inuit is Alaska. Regardless, Inuit are not, and do not, identify as 'Indians.' In Canada, there are no 'Indians,' but rather First Nations Canadians, Metis and Inuit.
When (daughter) Claire and (mother) Valerie flee, the two men would easily have caught up with them, especially since the females stopped behind a tree. Instead, the man following Claire falls, and the man pursuing Valerie oddly doesn't catch up to her.
At the crash site, the aircraft has apparently clipped a tree and knocked it down. However, a straight cut on the trunk and chips at the base indicates the tree was cut and left on the ground.
Near the end, when Steve confronts Valerie and her daughter, the mother and daughter were already threatened by Steve with the other two men, therefore Steve could not claim to not be violent.