Other mistake: When Heffron is taking his throw at darts, he states that he needs a "double seven". When he takes the throw, the dart goes into the treble eight (an earlier close-up confirms that the board has the standard Gamlin configuration), yet, from the reaction he gets, he's made the throw he was going for. (00:04:40)
Continuity mistake: In one scene, the barn-like structure ‘petit restaurant' has the words 'hotel' on the left and 'cafe' on the right, but the building gets a grenade to the upper floor to clear the two snipers pinning down Easy Company. After the retreat, the Germans march past and the Hotel/Cafe is fully restored and the window is back in place.