Continuity mistake: When Makkari brings the kid to safety at the beginning of the movie, a couple of her braids are behind the shoulder in the first shot, and in front of her shoulder in the next. (00:03:40)
Factual error: There is a billboard in London advertising a display of "artifacts" at the Natural History Museum. British English spells it "artefacts" and the Natural History Museum in London only holds exhibits on natural history. A display of artefacts would be at the British Museum, a completely different institution in a different part of London. (00:07:25)
Continuity mistake: When Sersi is interrogating the students, the one in third row who keeps drawing has a bunch of markers on his desk that keep changing position throughout the scene. (00:09:00)
Continuity mistake: Sersi asks the question about predators; two students answer mentioning lions and wolves, and do it from a position entirely different from the previous shot. (00:09:25)
Revealing mistake: Both Sersi and the student she saved have been covered by the fine dust she turned a fossil into, but the only trace of it is a little dust on top of the girl's hair; there's not a speck on her uniform or anywhere else. (00:09:55)
Continuity mistake: When Sersi gives Dane Whitman the ring in the club, her hand goes on/off his shoulder repeatedly. (00:12:00)
Continuity mistake: When Gilgamesh hammers the Deviant into the gates of Babylon, dealing the last strike after the dramatic pose, the shadows cast by the statues don't go much further away than their pedestal. In the following long shot the 5 Eternals have a massive area of shade behind them that extends very far away from the city walls. (00:21:30)
Continuity mistake: After the presentation of the steam engine, Phastus leans against the same table as Druig. Change of angle, and he's in a different position. (00:24:40)
Continuity mistake: When Makkari peeks at the Babylonians having a scuffle, most people at the table are seated, but in the next shot it's a full fledged brawl with everyone at the tables participating. (00:26:35)
Factual error: In the scene with Sersi creating water for the crops in Babylonia, it shows corn growing. Corn was only grown in the Americas, originating in Mesoamerica. They should have shown barley, wheat, or something else growing. (00:27:45)
Continuity mistake: When Ikaris flubs his line in the ancient language and Sersi and he share a moment, the hair moves on/off Gemma Chan's shoulder abruptly between shots. (00:29:00)
Audio problem: Ikaris says by mistake "I am very beautiful" in the local language. Sersi laughs and he asks what did he say. She says "You said..." but Gemma Chan's face is not moving. (00:29:10)
Continuity mistake: Sersi said "Bye" to Ajak's dead body. Lights begin to flicker and Ajak's throat to pulse; before the shot changes and the camera gets closer, look at Gemma Chan's hand sliding away from the thigh. It's firmly on top of her thigh again in the next shot, and when it cuts back to the first camera angle the hand is again more to the side. (00:33:55)
Continuity mistake: Ajak is trying to calm Thena down and initially she has some success, but the crack of a musket shot brings her back into the Mahd Wy'ry, and she attacks. Notice that Ajak blocks Athena's right arm with the back of her own right arm, but in the next shot the back of Salma Hayek's arm is against the inside of Angelina Jolie's left arm, so she gets free instantly and stabs her. (00:37:35)
Continuity mistake: When Thena faces Phastos in Tenochtitlan, their exchange of blows ends with her striking a cool pose with her sword upside down. Angelina Jolie's hands are in two different positions in the two shots, though. (00:38:00)
Continuity mistake: When Phastos cures Thena's hysteric outburst by punching her lights out, he gets down on one knee to check on her. Which knee, that depends on the shot; right first, then left. (00:38:20)
Continuity mistake: When Thena wakes up from her first attack of Mahd Wy'ry, there's a close-up of Angelina Jolie opening her eyes, and her mouth. Cut to a side view, and her eyes are open, but her mouth is shut. (00:38:40)
Continuity mistake: To convince Thena that she needs to be cured erasing her memories, Ajak puts a hand on her chest. The hand rests on a different spot each time the camera cuts away from it. (00:39:35)
Continuity mistake: Kingo is a Bollywood star. When we first see him involved in the dance routine, he fixes his hair and leaves the center stage to a female dancer. Meanwhile, in the background there are male dancers entering the scene. Look at the one that occupies the first archway to the right of the center; he's in a different position (close to the guards or close to the other pillar) in separate shots. (00:44:00)
Continuity mistake: During the Bollywood shooting, take a look at what goes on onstage after Karun Patel introduced himself. At the line "You have risen, Mighty one", Kingo is directly behind his co-star and both face the camera, but they were side to side just a moment before. (00:44:20)