See post #52, the cabin door was opened when they were around the corner. Someone could have just entered their cabin without their permission.
Also, I remember reading a post (I don't remember whether it was in this thread or not) in which someone did an experiment. He ordered a drink the old fashioned way (pun not intended) with his card while his friend used the medallion to order a drink. The drink ordered with the card came immediately. The drink ordered with the medallion came 20 minutes late, and it was the wrong drink.
So, I guess if you want to wait 20 minutes for the wrong drink to appear, you just cannot beat the medallion technology.