Jack stealing 3 chalices?
In the scene where Jack steals the chalices with Barbossa, it looks like he takes 3 chalices. He sneaks up to the table, takes the first one, and when the guy looks the other way he takes the second one. But then after they knock him unconscious Barbossa takes another chalice from the chair and throws it to Jack who puts it in his bag alongside the other one(s).
The only explanation I could think of is that maybe Jack put one of the chalices on the chair after taking it from the table, but really why would he do that and then walk away from it and leave Barbossa to throw it to him a few seconds later?