At the beginning when Nancy and Gina switch their blue bags, initially in the first shot, the one left behind for Nancy has a newspaper and a magazine in the side pocket. In the next shot when Nancy goes to pick it up, the side pocket is empty - newspaper and magazine are gone.
The avalanche comes down a mountain on the right side of the train, however Frank, Joe and Gina watch it approach from a window on the left side.
A train speeding through the snowy mountains does not start an avalanche but a pistol fired twice with a silencer installed does trigger one.