When Arthur says, "We had a wonderful time!" he looks at Carrie. In the next shot, he's looking at the TV. Then, Carrie's arms change position between shots.
When Gloria holds open the door for Arthur, she is hunched slightly. In the next shot, as the alarm starts to go off, she stands up straight.
When Jeff says the line about "the reports I wrote," he grins. In the next shot, he is not grinning.
When Arthur goes to look at the two videos, he starts to pick one up. In the next shot, he has a hand on each one. Then, when he tells Carrie she can pick any movie she wants, the videos jump from his right hand to his left.
When Doug talks to the receptionists and laughs at their fat joke, he waves the pen around. In the next shot, he has already stepped a few feet away from their table and is no longer holding the pen.
In the supermarket scene, The 2 liter sodas say Albertsons on it. New York doesn't have Albertsons Supermarkets or their sodas for sale.