At the end, in Castle, when Morgan addresses Gen Beckman, the first shot, from the front, shows him with his hands behind his back as he approaches the screen. The next shot, an immediate shot now from the rear, shows his hands crossed in front of him.
The B&W shot of the Paris train tracks that Morgan and Casey are looking at when trying to find Chuck and Sarah is actually of Moscow. The tracks lead to Kievskaya Train Station [The large glass arch] and also show the Stalin skyscraper at Smolenskaya Square.
When Chuck is on the payphone with General Beckman, they are cut off and a recording says "Zwei Euro nachlegen, bitte," which means "Please insert two Euros." The Euro, however, is not legal tender in Switzerland. The phone should only accept Swiss Francs.
In the beginning, when they open the door to their room, it is 50B. When Morgan zooms in on Chuck's ticket, it reads "Cabine 47B". That is actually the room number of Juan Diego Arnoldo. You can see the number behind him when Sarah is in his room.