Revealing mistake: Out of ideas, Willy rummages through Jennifer Crawford's belongings and finds an old copy of Dr. Seuss' "Oh, the Places You'll Go." It's a teal hardcover book with the front recognizable because of the cover picture. Later on, a sleepy Willy is surprised by the doctor as he reads the book to Jennifer. He closes it, and it has the splint on his right side, no cover picture. You don't get a good view of the other half of the book, but if he was reading it, he was then doing it while holding it upside down. (01:03:55 - 01:04:50)
Revealing mistake: When Lila wipes the cream off her face after Eddie gets the pill out of her nose, if you look at the towel, you can see a red mark appear on the towel. Most likely from the red make-up for her sunburn. (00:58:10)
Revealing mistake: During the keg drinking contest, it is clear that when they vomit on each other that the "vomit" isn't coming from their mouths but come from a pipe aligned with their mouth next to the side of their head.
Revealing mistake: During the long tracking shot at Dunkirk, steadicam operator Peter Robertson had a little assistance in getting around. This took the form of a kind of golf cart (from the beginning to just after shooting the horses), and later a rickshaw (from little after the choir to just before the steps ascending the billets). If you look at the ground to the left just as the camera begins backing away from the carousel, you can see tracks in the sand made by the rickshaw. Keep watching the sand near the actors' feet to see more.
Revealing mistake: When Chuck first moves into Larry's house and goes to sit down on the daughter's green chair, it's evident that Chuck's weight didn't collapse the chair but rather it's pulled out to the right as if it was yanked from under him to achieve the collapse effect.
Revealing mistake: When the dark-haired kid's hand gets cut off, no blood is ever seen spurting from the stump. (00:07:25)
Revealing mistake: When the Level 3 Sentry is firing up into the air for no apparent reason, it fires some rockets with a clear defined smoke trail behind them and disappear off screen. Then the shot jump cuts to further away and suddenly the smoke appears again, but the end of the smoke trails are solid and crisp indicating the animators used the smoke animation as if the rockets had just been fired from that spot... in the middle of the sky. (00:01:10)