When David is talking to Nina in the coffee shop, the level of Nina's coffee does not remain consistent.
In the first part of the coffee shop scene, David has got a watch, which later on disappears.
When David and Terry are trying out the Russian Vodka he removed from his mini fridge, David is seen putting the cap back on his bottle. Then on the very next shot, David is putting the cap back on again.
When David and Nina kiss on the sofa, her hands go from being down by her side, then move up and hold his face when they begin to kiss. Cut to TV then cut back again; they are still kissing but her hands are still tucked down by her side
In the coffee shop, the position of David's hand in relation to his coffee cup changes in nearly every shot.