Revealing mistake: When the 47 Ronin write down their names to swear fealty to the mission, they are cutting their thumbs on the swords to imprint their fingerprints on the document. The mistake is that they use the blunt edge of the sword to do this.
Revealing mistake: In the scene where Jake is about to enter the boat, he is hiding in a trailer so he can sneak up on one of Pope's men. When he jumps up, grabs the pole and stabs him in the chest with it, you can see it doesn't go through his chest, but instead it just goes in between his arm and his rib cage. You have to look closely to see.
Revealing mistake: When Brooke arrives at the camp to drop off Steph and Chrissy, Chrissy leans out of the car and vomits, but you can see that she's not really vomiting, and is using her hand to cover up the special effects tube.
Revealing mistake: During the big shoot-out at the end, the close-up of the brown Ford pickup is flipped side to side. Check out the F150 logo on the fender, which appears as a mirror image.
Revealing mistake: Not bad digital effects for a combination "Predator" and "Jurassic Park" monster movie, except that the dinosaurs don't cast shadows about half the time.
Revealing mistake: In each one of his scenes, every time you see Captain Fuller you can see that the actor is wearing contacts to make his eyes blue. It's obvious contacts with the brown rings of his natural eyes around them. And contacts were not invented for a long long time after this movie takes place.
Revealing mistake: At the end when the drone crashes in front of the car and the soldier gets out you can see the footprints in the sand from previous takes, in the exact spot where he steps.
Revealing mistake: Pablo and his buddy are driving through the middle of nowhere, and end up in the bucolic town of Red Stone. The first two people they drive by are armed with machetes. The close-up of the second one is reversed, as shown by the dilapidated street sign - it can't be deliberately shown by say, the car mirror, because they are looking at him turning their head. (00:05:40)
Revealing mistake: After Paul shoots the monkey he picks it up to put it in a box and the "dead monkey" is fake. (00:51:56)
Revealing mistake: When John attacks the 3 bad guys in the residence area, one of them throws John into the wall which wobbles. (01:00:35)
Revealing mistake: The female head trainer of the Tiger's Den puts a blindfold on and with a kick KOs the trainee that was sparring with the children. In the close-up of the kick you can see it is miles away from connecting. (00:17:05)
Revealing mistake: Just after Superman and Supergirl have their talk about him going after Brainiac, it cuts to Lois at the Daily Planet on her laptop. There is a close up and you can see her fingers on the keyboard. She is typing really fast, but the animation shows her fingers just hitting the same 3 or 4 keys over and over again. (00:20:05)