Revealing mistake: Diana is blind and not accustomed yet to her condition; multiple times throughout the movie if she bumps into something she staggers or drops what she is holding - for instance she drops the shopping bags when she bumps into the post meeting Chin. And yet when she is escaping from the police at Chin's house, she bumps into a drying rack and does not even flinch - in fact if you look closely you can see that the actress moved her hand on purpose to hit it cleanly at the proper angle that would make it fold. (00:44:55)
Revealing mistake: Dave Bautista announces that he has arrived. There's a close-up of the kickstand, and you can actually see scratches on the asphalt from previous takes (spotted also by Rian Johnson himself in his video breakdown of the arrival scene for the Vanity Fair youtube channel). (00:15:10)
Revealing mistake: The chalet was visible behind Emily when she was outside talking on the phone, but subsequent views of Emily showed her in front of a solid white background (mimicking snow) - indicating the use of a green (white?) screen. (00:13:34 - 00:13:56)
Revealing mistake: Corporal Shah is tied and on a chair in the command center. He then receives a powerful blow to his left check, knocking him sideways and rendering him unconscious. But his glasses do not even move a millimeter.
Revealing mistake: A white truck could be seen in Tamra's rear window, following her car at varying distances. After Tamra hit Randall on his bike, the white truck was still there but gone when the camera returned to a front view of Tamra. Use of a green screen - the truck could not have gone past the accident or "disappeared." (00:03:35 - 00:04:10)
Revealing mistake: The cell bars appear to be about 4" apart, but are much wider to accommodate the width of The Artist's face/head when there's a close-up of him next to the bars. (01:13:50 - 01:15:09)
Revealing mistake: Driving home from meeting Gigi, there is an image on the windshield of a blue handicapped parking permit/placard that is supposed to be hung on the rearview mirror, but there is no placard hanging - the permit's image is superimposed on the windshield. The image even briefly appears and reappears. (00:34:05)
Revealing mistake: When Otto, Tommy and Marisol find the frozen cat outside of the house it is a puppet prop. A few seconds later Tommy is holding it now back to a real animal and is bone dry.
Revealing mistake: Interior versus exterior views of the window sill/ledge are different when Brandon is aiming his rifle out. From inside the building, the window sill looks flat and the front tripod legs are close to the inside; from outside the window, the front tripod legs are over the window frame plus the ledge is layered. In some shots, it also looks like the window pane was opened horizontally to the left, but Brandon opened it by pushing it vertically upward to overlap the top pane. (01:00:43 - 01:01:41)
Revealing mistake: The appearance of the buildings/scenery opposite of FBI Director Gabriel Robinson's office vary, indicating the occasional use of a "green screen." The angles are inconsistent (wider or in the opposite direction) and sometimes grass and/or trees can be seen where the avenue between the buildings should be visible. (00:10:05 - 00:10:38)
Revealing mistake: The size of the spider walking off Sam's face becomes disproportionately smaller too fast compared to its size while on her cheek plus the spider's awkward movements are indicative of CGI. (00:02:20)
Revealing mistake: Younger Tom dropped his policeman's jacket onto the "fire" and when Younger Marion came over to the fire (almost 30 seconds later), the jacket still had not caught on fire. The next time the jacket was shown, most of it still looked unscathed by the fire. (01:33:30 - 01:35:36)
Revealing mistake: There are noticeable differences in the appearance/condition of the lattice panels on the deck (overlapping; whether there are missing/broken slats and, if so, their locations), but pinpointing most of the differences would require pausing. When Thomas was seated in front of the panel adjacent to the door, sometimes there were broken/missing slats but other times they were intact. Most revealing was the absence of the lattice panel opposite the front door when Liz was standing near Thomas. (00:42:17 - 00:49:42)
Revealing mistake: The rhino that killed (or "erased") Paul was obviously CGI and quite fake-looking, especially the way it was running. (01:32:50)
Revealing mistake: The front and rear views of the house did not seem to properly fit together. The rear view showed more sections, making the house longer than what the front indicated and had three high chimneys compared to only one from the front. The rear view also showed several trees that would be aligned in front of the house, but the trees did not appear to be situated that way. (00:27:49 - 00:29:52)
Revealing mistake: The stairs are a prop. About a dozen steep steps - just to the landing - are almost as high as the front door. (00:55:48)
Revealing mistake: The 50 dollar bills that appear in the opening credits all have the same serial number (and you can find online the texture they used with great ease, just like the one for the 20 dollar bills stack). (00:03:45)
Revealing mistake: An exterior view of the damaged building was shown after Orlando's chair bomb blew through the 10th floor windows. The damage from the earlier explosion on the 4th floor could be seen in the lower left-hand corner. However, there were only two floors between the damaged floors [putting Orlando on the 7th floor] when there should have been five. IF the 4th floor was actually the 4th floor, there were not enough floors above it for the bank to be on the 12th floor. (01:20:44)
Revealing mistake: The "snow" that Kip and his friends jumped into after leaving the bath house was obviously fake (like the "snow" on the pine trees). Beads of "snow" do not fly into the air when impacted by a weighted object, such as a body. (00:22:32)
Revealing mistake: The front view of the pirates in the golf cart with Darcy and Tom does not show the driver turning the steering wheel at all, which would mean the road was straight, but the when the road becomes visible again, it is diagonally behind the golf cart. (00:36:45)