Continuity mistake: When Sapper Morton is fighting K, he pushes him into the wall, causing the wall to break and the two fall through it. The damage from the wall leaves rubble scattered on the floor around them. Sapper begins to choke K, and the rubble surrounding them changes position when the shot cuts to a closer angle of K. (00:08:15)
Continuity mistake: When K is trying to scan Sapper Morton's eye to get the serial number, K sticks his left index finger into Sapper's eyelid and his three other fingers placed on his forehead. The shot cuts to a side view where K's index finger is now on Sapper's forehead, along with the rest of his hand. (00:08:45)
Continuity mistake: When Lieutenant Joshi is talking to K in her office, her whiskey glass is empty in one shot, but when she goes to sit down, her glass suddenly has some whiskey in it. (00:27:55)
Continuity mistake: When K finds the metal case in Sapper Morton's piano, after closing the piano lid, he is holding the case in his hands, with two fingers on his right hand pressed against the side of it. The shot cuts to another angle, where the two fingers on his right hand are now suddenly behind the case. (00:47:10)
Continuity mistake: When K is looking at the tree in Sapper Morton's garden, he has a cut on his eyelid. Just after K moves the soil on the root of the tree to reveal the 6 10 21 marking, the cut has disappeared. K then has a flashback to his implant memory, and the cut has suddenly reappeared. (00:48:30)
Continuity mistake: When K discovers the 6 10 21 marking on the root of the tree, the scene cuts to a wide shot where his car is shown parked to the right of the tree. When K walks back to the car, the car is suddenly parked to the left of the tree. (00:49:05)
Continuity mistake: After discovering the 6 10 21 marking on the tree, K starts to walk back to his car. In the next shot, the fire coming from Sapper Morton's house is suddenly reflected on the side of K's car. (00:49:15)
Continuity mistake: When Luv strikes Coco on the back of the neck, on the floor he is bleeding from his nostrils, a tear streak of blood is shown coming from his eye, and has blood spewing from his mouth. There is a shot of Luv for a few seconds in between these two shots, but the amount of blood that Coco is shown producing appears far too quickly for just a few seconds. (00:49:55)
Continuity mistake: When Dr. Badger is analysing the wooden horse, he begins turning the knob on the console, with two fingers turning the knob and the rest of his hand laid against the console, but from another angle, he is turning the knob with his entire hand. (01:34:25)
Continuity mistake: After analysing the wooden horse, Dr. Badger tells K he can get him a real horse, and K replies "I don't want a real horse, I just want to find out where it's from" and then looks in the direction of the horse. In the next shot, he is suddenly looking up at Dr. Badger. (01:34:50)
Continuity mistake: To analyse the wooden horse, Dr. Badger has it placed on a scanner, places a plastic container over it, lowers a console onto the container and rolls another piece of equipment up against the container. These pieces of equipment remain on the scanner, but just after K says he wants to know where the horse is from, the console has been raised to its original position, the plastic container has been removed from the scanner, and the other piece of equipment has been rolled back to its original position. The equipment could not have been moved when it was off-screen because there was there would not have been enough time in between shots. (01:34:45)
Continuity mistake: When Dr. Badger has finished analysing the wooden horse, he takes it off the scanner and holds it in both his hands, whilst still facing the scanner. The shot cuts to Dr. Badger giving the horse back to K, and he is suddenly holding the horse with one hand, and is facing K's direction. (01:34:55)
Continuity mistake: When Luv confronts Lieutenant Joshi in her office, in the shot where she switches off the computer monitors, there are a series of files on her desk in front of the monitors. There is a white file, next to it a black file, and next to that a beige file with two files under it. When Joshi stands up, the beige file and the files under it have gone and there is now a gap between the white and black files. Later on in the scene, after Luv picks up Joshi's body after stabbing her, the black file is on the left, the beige file is back and in the middle, but no files under it, and the white file is on the right. (01:38:00 - 01:40:05)
Continuity mistake: Just after Luv stabs Lieutenant Joshi, she goes over to her computers and switches on the monitors. She is still looking at the computers at the end of the shot, but in the next shot, she is suddenly looking to the right, at Joshi's body. (01:40:00)
Continuity mistake: When the three cars are driving through the city back to Wallace Corporation with Deckard, there is a shot shown from behind. In the shot, the car on the left is flying highest, the car on the right is flying lowest, and the car behind is flying in between the two. The shot then cuts to a wide shot, where the car on the right is now higher up than the car in the middle. (02:02:55)
Continuity mistake: When Deckard awakens in Wallace's office, after Wallace's visual aids leave and Deckard hears Wallace, he is lying back in the seat with his arms in the armrests. The shot cuts to an angle behind Deckard, where he is now suddenly hunched forwards. (02:09:15)
Continuity mistake: When Wallace says to Deckard "It was very clever to keep yourself empty of information, and all it cost you was everything. But you can still help me", the light above them begins to shine on Deckard, and his shoulder is covered in light. The shot cuts to a shot in front of Deckard, where his shoulder is suddenly much more shadowed, before being lit a second time. (02:13:20)
Continuity mistake: When the giant Joi walks over to K, the wide shot shows her stopping in front of the platform he is standing on, directly facing K's direction. The shot cuts to her kneeling down, and she has suddenly turned 90° to the left. (02:17:00)
Continuity mistake: In Sapper Morton's garden, when K finds the small plant next to the tree, he sniffs the plant and lowers his hand slightly, with his hand and the plant pointing upwards. The shot then cuts to an angle further away, where his hand and the plant are suddenly pointing to the side. (00:11:50)
Continuity mistake: When K is at his apartment, Joi lights his cigarette which smokes slightly. The shot cuts to a different angle, and there's much more smoke. (00:18:20)
Answer: Think of any manufacturing process. Samples of new products are frequently created and then immediately destroyed. Also, the new replicant would require processing, training, etc. It was simpler for him to just dispose of the test.