Revealing mistake: When Tom joins Sarah and Eliot for the kneeboarding, after Sarah apologizes for Tom's interrogation Eliot says, "It's okay, my dad would've done the same thing." Two shots later, as Tom grunts in the water, this shot is flipped - the driver is now on the left and the kids switched sides.
Continuity mistake: Nora's labor starts and her water breaks in the canoe, yet when she is helped ashore minutes later her pants are completely dry.
Continuity mistake: After Tom reveals Sarah's interest in Eliot, when Lorraine walks by vowing never to help Sarah again, Bud holds a burger in his right hand and a plate with a hot dog on it in his left. Next shot he's eating a hot dog with his right hand, while holding a burger with his left. (00:46:20)
Continuity mistake: When the Bakers and the Murtaughs are having their camp-outs by the lake, Tom suddenly has a pair of binoculars, which were not there before, so he can spy on the Murtaughs.