There is supposed to be only one "thing" different on each side, and so far no one has posted/admitted to figuring it out.
OK so this may be a long time in answering, it has been nagging at me for the last few months but I never had the time to compare both sides of the plane until yesterday. I think it may be the position of Mickeys hands. When viewed from the left side of the plane his left hand/arm is higher than his right hand/arm and when viewed from the right side of the plane the right hand/arm is higher than the left hand/arm. Am I correct?