Continuity mistake: The cocktail napkin that Ally crumpled and set on the table changes position (and shape) a few times, from largely hidden behind her drink to out in the open near the center of the table. (00:13:40)
Continuity mistake: The bar room background changes, indicating use of a green screen. Particularly noticeable is the absence of the "BUD" sign (that was on the wall to the left of the screen) at the end of the scene. (00:33:29 - 00:35:16)