On the drive to pick up the kids from camp Ben has his head turned toward Katie, but in the reverse angle Ben is looking straight ahead then turns toward Katie.
During the dinner when the family is discussing their high lows of the day, Erin's food on her plate keeps changing.
The Ford Expedition's rear window defroster appears and reappears during different driving scenes.
Ben's wine glass and the bottle during dinner with Stan.
When Katie and Ben are in the first restaurant, Katie is shown eating with a fork in her right hand and a knife placed between her two plates. In the reverse shot the knife is gone.
During the start of the "there is no ass" conversation between the Reiner and Willis characters as the camera goes backwards, you can see the white tennis shoes/legs of a crew member walking backwards in the reflection of the glass railing.