The Band-Aid over Austen's left eye changes positions.
When Alice goes to visit the guys, Teddy comes in with an unwrapped bunch of flowers. When they go to the kitchen the bunch is wrapped; once they are in the kitchen the flowers are unwrapped again.
When out to dinner, the amount of wine in the glasses changes between scenes.
When Alice first meets Zoey, as Zoey is walking into the house she specifically tells Alice to take off her shoes before entering the house as it is a "big thing" that no one wears shoes in the house. The very next time Zoey and Alice are inside Zoey's house, Zoey is clearly wearing shoes though Alice is barefoot as she insists that Alice babysit her daughter while she goes out.
While Harry drives the car, the windshield-wipers are missing and the driver-side post is rotating.