The cop takes Dan's driver's license after his accident and then later Dan says he can no longer drive because he doesn't have a license. Although the police can take your license in lieu of a cash bond, they can not take away your driving privileges. You can still drive while waiting for your court date by using the ticket as your driver's identification. Typically only your state's DMV or a judge can revoke your driving privileges.
In the scene where Dan is talking to Cindy and Jim, the father and daughter that are going to syndicate his column, you can see Mitch's chair next to Dan move close so that Mitch's leg is touching Dan's and further away, then close, then far again to Dan's chair.
During the end credits when everyone is dancing in a circle, Marie's strap on her dress is falling down on her arm, then it cuts to a different angle and the strap is magically back up on her shoulder.
At the end of the movie the family is seen driving back from New England to New York City. Their car travels west over the Queensboro Bridge from Queens into Manhattan. It makes very little sense to ever enter Queens when coming from New England if traveling into Manhattan. The Triboro Bridge (now called the Robert F. Kennedy Bridge) which takes you from the Bronx to Queens can also take you to Manhattan. Entering Queens would make the trip longer and cause you to pay an extra toll.
Dan stops for gas in New Jersey while he and the girls are driving up to the family's house. He is shown pumping gas. While it is against the law in New Jersey to pump your own gas, it is sometimes done and usually overlooked as an infraction by station staff.