Other mistake: After realising they can track the mother box, Batman says they have to go back to his base to use one of his satellites to track it, and they all do so. Which completely ignores the fact that Cyborg could easily access the satellite feed directly using his abilities and display it to the others on any nearby screen in Star Labs.
Other mistake: During Hutch's flashback to when he was about to assassinate the man who skimmed $1 million, he says he was holding an H&K .45. However, at that exact moment you can see "9mm" on the side of the gun.
Other mistake: On the prison computer scan of Ernst Stavro Blofeld, Blofeld's date of birth is shown as 4th July 1946, but he is only meant to be a few years older than James Bond, as seen in the photo of them together as teenagers in the film Spectre. That photo is meant to be circa 1985, and the newspaper clipping (also shown in Spectre) about Franz Oberhauser's (aka Blofeld) death in the avalanche happened when he was 16 years old. If he was 16 in 1985 then he should have been born in 1969, not 1946.
Other mistake: Throughout the movie, the timeframe of Ikaris and Sersi's relationship seems to constantly change; their first kiss is in 575 BC, but Phastus in 2020 asks her how could she stand him for 5000 years. Sprite tells Dane that they broke up 100 years before, but he leaves her because he can't stand to keep secret from her the mission. Which is a problem, since he mentioned that Ajak told him that when they left Babylon, so around 500 BC.
Other mistake: Sandman AKA Flint Marko is the first of the villains to be changed back at the Statue of Liberty fight, and he is told by Peter to stay inside the head to be safe. Seconds later Electro discharges a massive electric surge onto the statue head, which is made of bronze, which is a good electric conductor. Marko should not have survived that. (01:47:40 - 01:48:10)
Other mistake: The driver tells his partner that his firearm is empty, and he has no bullets in it. In the beginning he was given a loaner firearm until he could purchase his own. He's been with the company for a while now so that makes no sense. Also, for a trained professional who killed six robbers with precise accuracy it's hard to fathom he would not notice his gun weighing less. A loaded Glock 17 weighs 8.5 ounces heavier than an empty one. Plus the guards carry spare magazines, where are his? (01:20:00 - 01:22:30)
Other mistake: Jim's truck is shown parked in a space in front of the Border Patrol building, and the spaces have those cement barriers that keep vehicles from pulling in too far (in this case, yellow ones). Then when Jim later pulls out of the space, he puts the truck in "Drive" and goes forward with no consequence. (00:25:06 - 00:27:11)
Other mistake: Rebecca electrocuted the giant sand worm within 3' of the spaceship. After Lt Astrid arrives, some views show Rebecca out in the open, but the camera should have been obstructed by the spaceship because following front views still show Rebecca next to the spaceship. Also, at least part of the dead giant sand worm probably should have been visible at times but was not. (00:51:55 - 00:52:20)
Other mistake: After entering Rosie's Cafe, the Virtuoso, narrating, says, "You pick a seat that lets you keep an eye on both men but leaves your back vulnerable." He then sits at a table in the far corner with only a lamp on a small stand/desk behind him. The Virtuoso's back would be INvulnerable, and he should not want to sit anywhere that makes him "vulnerable." (00:31:50)
Other mistake: Jed has eight rounds on him/in his pistol. He tells Chad to go to his saddlebag to get another round of ammo and keep it in his pocket. Jed tells Chad "Let's play catch the bullet" since Chad (not his marshal dad Britt) is the only MacMasters there. Jed fires six rounds before Britt shows up on top of the hill, then two more (eight rounds). Jed shoots a ninth and tenth round before he tells Chad, "Get that ammo." Chad is never shown giving Jed the ammo from his pocket, but Jed keeps shooting. (01:13:42 - 01:17:46)
Other mistake: Phone shows calls received at 10:28PM (which happened minutes before the scene) and yet the phone says it's 2:11. (00:36:26)
Other mistake: At the school, a police officer told Owen, "Let's go" (move his vehicle). Owen tells Connor "We're playing hooky", makes a sharp turn, speeds past three school buses parked along the road, and passes a police office and school crossing guard (who didn't seem to notice). School zones have 15 MPH limits and police take speeding in these areas very seriously. A motorists violating in a school zone like Owen did would be pursued and cited with multiple offenses. (00:05:40)
Other mistake: Packie arrived at Frank's garage on a bicycle, wearing a brown coat, hat, gray hooded sweatshirt, patterned shirt, and a T-shirt. Swaino arrived on a motorcycle, wearing a tight jacket, no hat, black gloves, and black jogging jacket with white trim. When they were outside by the grill, they had large sweaters over their coats. It isn't known where these sweaters came from. It can be assumed the blanket Swaino used at first was from Frank's garage, but the sweaters did not appear to be Frank's. (00:25:32 - 00:37:35)