Revealing mistake: The computers in the bank have Excel running with the familiar yellow "Enable Editing" bar at the top, so none of the work the characters are doing would actually be saved. Either the main character is pretending to work, or he would be very disappointed when returning to his spreadsheet.
Revealing mistake: While Stack and Smoke are talking with the man about buying the barn, Stack walks behind the man and he blends in with the man talking. It is a layering issue.
Revealing mistake: Blood splatters, gun sparks, smoke, and hole effects during the shootout in the saloon are all fake cheap CGI. It's especially egregious in the shot where Doc is shooting from behind the table and you see only the back of the guy next to him, wearing an apron. (00:38:05)
Revealing mistake: After Dhani breaks the towing cable and the bus plummets downhill, the horizon is noticeably slanted - revealing that the camera has been tilted and the road isn't actually steep.
Revealing mistake: In the "Where You Are" number, when Ingrid Luna reaches for the lamp pull chain switch, her hand doesn't actually grab onto anything. (00:43:18)
Revealing mistake: When Ryan Philippe is lying in bed paralysed from the waist down talking to Doctor Rose, the camera zooms out. She is sitting on a chair, and all you can see are Ryan's legs, which he moves. (00:44:29)
Revealing mistake: Will answers a video call from Sandra, and after he says what's up, her video appears, and she's already talking mid-sentence. (00:02:45)
Revealing mistake: The guy whipping her horse, Sonja throws a chain around his neck from behind and yanks him. However, you can see the actor starts to throw himself backwards before Sonja even pulls on the chain, jumping the cue.
Revealing mistake: When Happy and his caddy are on the final green at the Maxi competition, the shafts of the clubs are distorted after they catch them.
Revealing mistake: The sweat patch on the man's blue shirt changes. (00:21:55)
Revealing mistake: When Lilo hugs Stitch goodbye, Nani reaches out to pet his head and back a couple of times, but the actress completely misses her mark, ending up always caressing empty air instead of Stitch. She misses again when she tries to pet Stitch after he's freed (timecode 01:32:47). This second time it's a blink-and-you-miss-it moment, but once you notice it, you can't unsee it. (01:30:52)
Revealing mistake: During the pimp interrogation, the pimp flinches a second before getting shot. (01:04:13)
Revealing mistake: When Krypto is playing with Superman, he says, "Sit! Stay!" and then Superman's left foot suddenly stretches out unnaturally, like an oversized clown shoe. (00:06:57)
Suggested correction: I'm not sure this is a valid correction, but I'm also not sure this is a valid mistake. This appears to simply be a result of the camera lens creating some minor distortion at the edge of the frame, since it only happens when his foot reaches the corner of the screen. While it looks odd, I think it's dubious and debatable whether or not this is a "mistake", and opens a can of worms where any frame distortion, even intentional, could be considered a mistake. Not my decision, though.
Apparently, the effect is either a distortion caused by the curved LED wall they used or the lens. Whatever the cause, Superman's clown-shoe look was never meant to make it on screen. This site is littered with similar issues: lens distortions, colour mismatches, faulty rear projections, and more.