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: 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: KantMiss puts the chicken badge in her sister's hand. Actually through her hand, since it stabs her with a long and sharp pin. But as she holds her hand, the long piece of metal is gone - it's perfectly fine for the characters to suddenly heal from one scene to another since it's a crazy spoof movie, but here we are midway through a visual gag and the nail is missing while the girl is still screaming in pain trying in vain to pull free. (00:04:00)
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)
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: Toward the beginning of the movie when they go to Pricemart, you can see Benny's written across the back wall in neon red letters. Benny's was the real store where the scene was filmed. (00:07:20)
Revealing mistake: Close-up views of Billy riding Allie on the mini-bike (trying to escape the men following in the Jeep) did not include the lower half of the mini-bike; they were probably on a platform/trailer being pulled by a car. A 12-year-old (?) boy would have difficulty steering and maneuvering a mini-bike with a rider similar in size/weight and would have undoubtedly wrecked when he turned his body around from the waist up to look in back of him at the tailing Jeep. Billy also kept turning the throttle. (00:25:40)