Continuity mistake: When Jerry and the Dr. are talking in the tent the first night on the way to the mountain, the Dr. shows Jerry a notebook with a picture of his wife and son. Jerry hands the notebook back twice in a repeat of the same shot.
Continuity mistake: when Maya goes to lasso the Doctor after he fell through the ice, her left paw is through the loop in the rope, but when it cuts to the Doctor and back, the loop is shorter and horizontal.
Continuity mistake: When Jerry meets Dr. Andy Harrison at the "convention" and they pick up drinks, notice Jerry's beer mug. The amount of liquid reduces as they go to the table, without him ever taking a sip.