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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)

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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)

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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)

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Factual error: It can be argued that the MCU is not quite our world, but certainly mirrors it closely - after all, the movie makes a point to feature real life dates and events such as Hiroshima, showing that even Cap America's actions in Europe didn't alter the outcome of WW2. It's then quite puzzling to see then Sersi gifting the savages in Mesopotamia a golden dagger that reproduces with precision one of the golden daggers in the tombs from Ur; they were Mesopotamian artefacts, sure, but from around 2600 BC and the scene takes place in 5000 BC.

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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)

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Other mistake: The Eternal's "Domo" is in Iraq. Phastus gives a radar device to Makkari and tells her to go find the Emergence point. We see her sprint away and pass by the Cristo Redentor statue in Rio, and then end up in a spot in the Indian Ocean (she is holding the global map and we see the landmark) that is practically in the Arabian Sea. So the radar brought her literally around the world to get almost to the starting point. Later in the movie Ikaris flies up in space from that spot, and is staring down at South America.

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Continuity mistake: At the beginning of the fight in the Amazon, Sprite runs to Karun to protect him like Kingo asked. In the wide shot there's nobody on the porch behind him, but when she calls him 'young man' suddenly there are a couple of people there. (01:13:00)

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Stupidity: In the scene that presents Sprite for the first time, she changes her appearance right in the well lit doorway. Literally everyone inside the pub can see her. (00:11:00)

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Continuity mistake: Gilgamesh opens the door and walks towards the oven outside. During the scene, the shadows by the oven change depending on the shot. (00:50:35)

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Continuity mistake: During the interview that establishes that the protagonist is boring, behind Kingo you can see that there's a single seat at the back of the plane to the right of the door on the wall of posters. Kingo is talking to Sprite in front of the posters, and that chair is empty. She blurts out that Kingo abandoned her in Macedonia, and suddenly Kingo gets a reaction shot from Karun that was shooting from that seat. (00:48:30)

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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)

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Other mistake: In 5000 BC, Eternals communicate between themselves using contemporary English. That's only expected in a movie, and they speak with natives using their own language, which some of them struggle to learn, nothing strange. Problem is, several Eternals speak English with a very noticeable accent (Scottish, Mexican, Indian) that predates any time when those cultures/nationalities existed. Lauren Ridloff's Makkari being mute speaks with ASL; American sign language, created in the early XIX century.

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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.

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Stupidity: Arishem's plan with the Deviants hardly makes any sense; he sent out biological beasts that he can't control, to kill off the natural predators of every planet. Forgetting the fact that obviously it didn't work (but the movie does not say that) because Earth has always had predators, that's a terrible plan to begin with, since any ecosystem needs predators or the other animals will grow uncontrollably.

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Plot hole: Deviants were created to get rid of dangerous local predators allowing intelligent life to thrive on the planets Arishem 'seeded'. He then created the Eternals to get rid of the Deviants once he realised they eat the species they should have protected. Problem is, it is stated that the Eternals go through their extermination routine multiple times. But the 'mistake' can't be happening all over again in a cycle, and Deviants would ruin a planet if left unattended.

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Stupidity: In the scene around Tenochtitlan, the Eternals have a device that allow them to locate the Deviants - they know for sure that they have exterminated every breathing one. In the rest of the movie this technology is never brought up again. It also makes it really odd that it took them 6,500 years to kill the Deviants, apparently never actively hunting them.

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Other mistake: When Arishem shows his plan to Sersi, the Celestial emerging from Earth is a huge being that completely breaks the planet apart. In the movie finale, the Celestial's hand and head have popped out, but he's much smaller - thankfully, because if he truly had limbs the size of continents, the planet would have exploded before anyone could do anything about it. At that size (again, judging from lack of permanent damage from his half-birth) it's hard to imagine why his birth is supposedly doomsday.

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Other mistake: Ajak uses her power to close wounds on other Eternals and when a creature heals itself everyone thinks it is Ajak's power, indicating she is the only one capable of such a feat. However, in the rest of the movie some Eternals pick up significant injuries, but even without 'the healer' are fine.

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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)

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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)

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