This slip up occurs at the beginning of the movie. When Jack wakes up in the house with Kate and the kids in the bed, he runs downstairs to leave. His father in law says "It isn't even 8AM yet". When Jack returns, Kate says "You've been gone 6 hours", however the clock on the wall says 9:00 and it's clearly still morning . She then says, "Get dressed. We only have a few minutes to get ready for the party". When they show up at the party, it's dark and the clock on the wall at the party house says 7:30.