Continuity mistake: During the first face-off between Jakob and Dominic, Letty's bike lies on the ground facing opposite directions depending on the camera angle. (00:21:40)
Character mistake: The woman with the AK-47 doesn't have the covers on the red dot optic open. In other words, she can't see her target.
Continuity mistake: When Patrizia paints her phone number on the scooter's windshield the numbers change between shots, check the 5 for example.
Continuity mistake: While at Dino Stop, Katie convinces her dad not to play it safe and to take a chance to save the world. Rick agrees and extends his left hand for the "all hands, Mitchell family on three." In the closeup we see Katie put in her right hand, but in the wide shot Katie's left hand pulls out. Also, note that in the closeup both Katie's and Aaron's positions between their parents are switched. (00:45:00)
Revealing mistake: When you see Hutch walking backwards through a doorway firing his gun, you can see an actor in the background in the entrance looking directly at the camera. As Hutch passes past him, he puts his head against a wall and plays dead again. (01:18:32)
Factual error: The girl in Ed Warren's hospital room is wearing a UConn sweater with the wordmark from their 2013 logo rebrand that had not existed anywhere near 1981. (00:21:30)
Visible crew/equipment: Waller is telling "Task Force X" about the additional mission they need to pursue, saving Rick Flag. Watch the shot when Bloodsport repeats "Rick Flag?" and Waller replies "I know." The team is going through dense, uninhabited tropical jungle, but in the trees there are people in T-shirts just standing around looking at them. (00:31:50)
Revealing mistake: As Liam Neeson looks at the money in the bag, he turns it over and it says "motion picture use only" on it.
Continuity mistake: After the intro, the scene dissolves into a map that resembles the branches that trapped Aguirre. A shot later the design of the map is different.
Continuity mistake: When Jang and Tiger are talking at the poker game, Jang points a gun at Tiger and is the gun seen pressing against Tiger's forehead. In the next shot, the gun is suddenly a few inches away from Tiger's forehead. (00:18:40)
Continuity mistake: When Booth first arrives in Bali on the boat he's wearing a brightly patterned tropical shirt, and between shots the shirt's pattern completely changes, though it's the same style of shirt, then it changes back again. (00:13:40)
Continuity mistake: When Mrs. Krementz talks with Zeffirelli while he's taking a bath and asks her to close the bathtub curtain, the cigarette he previously had in the mouth disappears in the next shot when Mrs. Krementz closes the curtain.
Deliberate mistake: When the gangs meet in the toilets to set a date for the brawl, the mirror on the left is the only one opaque, most surely to avoid reflections of the filming crew.
Continuity mistake: Towards the end, before his arrest, Mr. Crystal's fur is messy; it goes back to being clean less than 2 minutes later when he steps on stage.
Factual error: The advertising boards on the upper level of the arena for Delta Airlines and United Airlines are anachronistic for 1999. The logo for Delta did not take that form until 2007, and the logo for United did not take that form until their merger with Continental Airlines in 2010.
Revealing mistake: When Angela walks on the lawn to meet her husband, she clips through the shadow of the CGI billboard behind. (00:06:39)
Continuity mistake: After Silas is killed, in the wide shot Cyborg is standing mostly upright in front of Flash. Cut to a closer shot and he's bent over. (02:51:45)
Factual error: There is a calendar in a scene towards the end of the movie which shows the date as Wednesday April 30, 2021 but the calendar does not align to the days of a real calendar. That date will be a Friday. (01:25:54)