Other mistake: Fireworks use heated metals to produce the various colors seen when they explode - Iron, Nickel, Cryolite, magnesium and copper filings. Flying a jet engine through exploding fireworks would cause serious damage to the engine.
Character mistake: Barbara is in her office looking for the one item they need help to identify when Diana walks in. She says "OK, item number 23." She suddenly finds it saying "here it is" and reaches in the box to grab the Dreamstone. The ticket says item #24. (00:22:18 - 00:22:50)
Factual error: When Diana first brings Steve into the DC Metro, the modern-day signage visible inside L'Enfant Plaza Station is not era-appropriate to 1984. It includes markers for the Green Line (opened in 1991) and Silver Line (opened in 2014), and all markers are shown with printed abbreviations, which were not added until the Silver Line opened. (00:57:49)
Factual error: As his secretary Raquel tried to tell him, Max has his kid with him because he gets to see him on weekends, and that's 'his weekend'. Good but...it is not the weekend. This is Wonder Woman 1984, and the robbery happened on July 1st, Sunday, and this scene happens two days after that. Maxwell's "weekend" is happening on a Tuesday. (00:36:25)
Other mistake: Barbara in her rage against the dangerous drunk throws him against a parked truck. The impact is so strong it deforms the truck bed. By a LOT, and yet the guy is able to get up (on his knees at least). That impact should have pulverized his ribs, he's not a superhero. (01:15:25)
Factual error: As Barbara Minerva is introduced together with her comical inability to walk properly on heels, she passes by "Henry" the elephant at the Smithsonian. But the elephant is on the newly designed infographic podium of our present day, inaugurated in 2015. In 1984 he'd have been on a simpler, differently designed stand. (00:20:10)
Continuity mistake: In the gym sequence, the weight lifters in the left background are doing different things from one cut to the next. (00:53:30)
Plot hole: The established rule of the wishing stone says that you get one wish, to the point that Max couldn't grant a second wish to the guy who wished a Porsche even if Max was really eager to get his help, and warned his son against wasting his, screaming disappointed when he did waste it. But all of a sudden, he can grant Cheetah a second wish because he's "feeling generous". Without rules, he'd be some omnipotent being who can do anything. The fun part is that there was no need at all for this mess, since Barbara's second wish by its nature (and even the way she formulates it) supersedes the first...but Max couldn't know that. (02:01:10)
Factual error: When Wonder Woman and Steve Trevor are walking out at night near the Washington monument, a plane passes overhead. A TWA Airlines A320 or A319, which Steve looks at and says "amazing." Moments before that, Wonder Woman has confirmed that the year is 1984. The only problem is, a TWA never operated that kind of airplane and the A320/A319 didn't even exist in 1984. (00:47:43)
Factual error: The F111 that they pilfer from the Smithsonian doesn't carry enough fuel to make it from DC to Cairo without refuelling; also the aircraft on display at the Smithsonian are not fuelled or flight ready.
Factual error: When Diana is about to land on the remote base, a CRAM fires at her and attempts to take her down. The CRAM was not developed until 2006.