When Ann and Bub (Eric Linden) parachute into the lake together, his chute is suddenly no longer on his back once they are in the water. And they leave the parachute floating in the lake after being picked up.
When Ann and Bud are out for their night flight in the fog, they set out with Bud sitting on the left and Ann on the right. When they run out of gas and are spiraling down, there is a brief shot showing them reversed in the cockpit. Then just after they land, they are back in their previous positions.