Revealing mistake: During the scene with Maverick and Rooster in the F-14A, you can see the cockpit of the F-18F being reflected off Rooster's visor on the helmet.
Revealing mistake: When Gerard Butler is driving to the warehouse to find Frank, the speedometer and the rev counter are on 0.
Suggested correction: I could not see Will's speedometer or tachometer (RPM gauge) during his drive to Frank's. What I did see (and believe you saw) was the patrol officer's instrument panel while he was parked along the road using radar. This was before he pulled out to chase Will's speeding SUV, so both gauges should have been on the far left (i.e, on "0"). [00:46:28].
Revealing mistake: When Sonic and Tails arrive in Green Hills on the biplane, Tom and Maddie are looking up at them, but not focused on the same point. Instead, Maddie is looking to the left, and Tom to the right.
Revealing mistake: When Ritchie tackles Sam down the stairs, you can get a pretty clear look at both the stunt-man and stunt-woman's faces as they fall. They then switch back to the actual actors once they reach the bottom of the stairs.
Revealing mistake: While in the helicopter, Alan's eyes do not align with the location of the Dreadnoughtus. Alan is looking to his far right before the helicopter even approaches the dinosaur and it is shown across the front of the screen. Alan's eyes then stay fixed straight ahead (even after passing the dinosaur), giving the impression he's looking at the dinosaur, but he would have needed to keep turning his neck to the right as the helicopter flew past in order to keep it in sight. (00:35:14)
Suggested correction: It's a common movie trope. The two things aren't happening in sequential order. They're happening at the same time. Alan isn't looking before the helicopter approaches the dinosaur...you're seeing the inside of the helicopter as it approaches and passes the dinosaur. They're happening at the same time.
Revealing mistake: When M3gan grabs the dog through the hole in the fence, the face of the person is not M3gan. (00:37:31)
Revealing mistake: The owl that JP saw was obviously "fake" (stuffed or CGI). Its nose was crooked and its puffy cheeks made it look like it had cheek filler injections; owls have flat faces. (00:32:50)
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: 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: 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: The guy with the sunglasses changes from behind and in front of shots. (00:09:46 - 00:10:15)
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: 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: When William and Jack open the door, enter the room, and walk past the helium-filled balloons (tied to a chair about 4' away), the balloons remain immobile. Due to how light helium balloons are, just opening the door or breathing nearby would be enough to cause the balloons to move somewhat - if they were actually there. (00:16:00)
Revealing mistake: In the scene wherein Detective Marquez and Senora Borden are drinking wine by the (indoor) pool, the back of Det. Marquez's head is disproportionately large. Front views of Det. Marquez often show his head tilted to the left, but rear views usually do not and his head might even be tilted to the right. Also, Senora Borden's eyes do not appear to be aimed correctly at Det. Marquez's (especially since they are facing each other with heads tilted to the right). Use of stand-in and/or green screen. (01:02:30 - 01:03:10)
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: 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 "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: 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: When Danny follows Maria outside, he is in front of a well-lighted wide patio door with side windows and there are numerous decorative lights to his right. Thereafter, close-up views of him talking show only some small red lights to his right; the rest of the screen is black. Wide views continue showing the lit entryway behind him. (00:08:44)