Character mistake: In the courtyard of the castle there is an anti-aircraft gun. You could probably not find a worse place for a gun like that even if you tried (except maybe if you put it inside, in a windowless room). In the position it is placed it can only fire at targets directly ABOVE the castle. What you want to do is fire at targets BEFORE they reach the castle. It would be better if they placed it on the roof, or even near the village below.
Character mistake: Before entering the tavern,Smith tells the team to meet outside in a 1/2 hour. When they are sitting at the table just before capture, he says he gave orders for nobody to leave.