Other mistake: Under the Gazebo when Penny is giving a lesson to the group, the opening shot is zoomed in on people's feet. The 5th person is a lady wearing red kitten heels. When the picture zooms out to show the entire group, the lady with the red heels is gone. (00:04:40)
Other mistake: In the scene were Patrick breaks the car window, when he walks to his seat you can see a point of red light (like a laser) on his back. (00:40:45)
Other mistake: When Johnny breaks his car window, he is getting soaked but Baby is completely dry - her coat never gets wet.
Answer: The father says they're leaving the next day, but when the mother asks why, he realizes he'd need to explain what happened, so he decides not to leave, and they stay for the rest of the trip as originally planned.