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: Before Derek punches the side of the wall, you can see the weakened area of the wall before impact. Look at the color difference.
Revealing mistake: In the first part of the movie when the dad finds the house in the woods after the car accident, he walks through the door with his daughters in the snow, and just before entering we can see he walks on a fake snow carpet.
Revealing mistake: A reporter is interviewing Jobs using an old analogue tape deck recorder - the reporter says he's recording, and a red light is on the hand held tape deck unit, but the tape and its spools are not spinning - the unit is not switched on. (00:53:00)
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: 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: 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: 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: When Agnes slits Manny's throat, you can see the crease on the prosthetic part of his neck. And the blood flow looks totally fake. (00:37:45)
Revealing mistake: When Eliza is negotiating a deal to sell the pig to Magda whilst sitting at the kitchen table, Magda takes out her phone to call someone. When she puts the phone to her ear, a search bar and keypad can be seen instead of the call screen, revealing that she is not actually making a call. (00:28:30)