When John and Roy are rappelling down the cliff face, the stunt doubles are very obviously much more muscular than the regular actors.
The snakebite victim is bitten in the left arm. Dr. Bracket instructs the paramedics to insert an IV in the opposite (right) arm. When the arrive at the hospital, Johnny Gage hangs up the IV bag, and the IV is clearly in the left arm. Update: The I.V. tube crosses over the patient's chest to the right arm. Johnny walks along the patient's right side as the patient is transported through the hospital corridor.