Continuity mistake: Right after Clooney picks the kids up from pre-school. It was superhero day, so the kids are dressed in homemade costumes. If you watch the little girl, she changes back and forth between superhero and little girl within the blink of an eye.
Continuity mistake: When Jack and Melanie are arguing and waiting for a cab to get to the soccer match, the kids interrupt them and you see a cab is waiting. The cab is a Ford Crown Victoria. They are then seen traveling in the cab, which is now a Chevrolet Caprice, which they exit before Melanie goes to her meeting for drinks.