What If... Captain Carter Were the First Avenger? - S1-E1
Other mistake: The premise of the first episode is flawed; "a single choice" should make the difference, the choice being identified as Ms. Carter not leaving the room to get in the observation booth. But in the normal timeline the booth is exactly where all the other characters were. In this reality everyone else is downstairs, with the German spy that inexplicably sets the bomb early. If anything, it's his bizarre, suicidal choice that matters.
Suggested correction: Except it was her decision to not leave the room that delayed the procedure and gave Heinz Kruger the chance to attack. And with her in the room, she is now given the chance to volunteer to take the serum.
How did her staying delay the procedure? Besides, in OTL the spy only triggered the bomb after he saw the procedure succeed, to know it works before stealing it.
What If... Ultron Won? - S1-E8
Plot hole: At the end of the previous episode, the Watcher gets surprised (literally saying "wait, what?") by the arrival of Infinity Ultron inside Party Thor's universe.In this episode we find out the story of Ultron.Ultron realises for the first time that there are other universes to conquer right then because he can'hear' the Watcher talk (to whom?) and goes after him.So the two episodes don't match;Ultron couldn't have reached the other universe "before" his realization, and Uatu is again surprised by it.
What If... Doctor Strange Lost His Heart Instead of His Hands? - S1-E4
Plot hole: The episode has wonderful writing from a pure storytelling perspective, however it has zero coherence with the MCU it is supposedly part of. The show was written way before "Loki", for instance, and concepts like "Absolute points" are at odds with it. Likewise, Strange and the Ancient One's powers are radically different (Strange can't foresee the future but can go back at will without rewinding and his mentor can seemingly see past her own death).
Other mistake: Supposedly the one difference between this universe and the movie canon is that Janet was infected by a zombie virus before she was saved by Hank and Scott. However, in the original movie Janet actively led them to her by 'possessing' Scott and while intelligent, these Marvel zombies can't communicate. Also, Vision is settled in Camp Leigh, which appears to be in perfect shape despite being hit by a missile powerful enough to penetrate in the bunker in Winter Soldier.
Suggested correction: As I said in my other correction, differences between the MCU movies and this show cannot count as mistakes, since they are showing us different universes with different outcomes. Just because Janet lead Scott to them in the movie doesn't mean that's what happened in the show's universe. Same with the "Winter Soldier" discrepancy.
Without Janet leading them, they wouldn't have even learned about her existence based on what was shown in Antman and The Wasp, and they show the laboratory scene pan out as it did in the movie. Althought technically she could have been infected by the zombie virus in the minutes it took them to get to her inside the Quantum Realm. You realise that it's flimsy and it relies on people essentially not remembering the movie, though.
What If... Ultron Won? - S1-E8
Plot hole: Ultron cuts through Thanos like butter and acquires the Infinity Stones. He does so after he kills all life on the planet (-2). So Thanos has all the Stones (except Vision/Ultron's) years earlier than normal continuity, for no reason. Not just that; Ultron proceeds then to 'silence' the rest of the universe one planet at a time (which would take forever; Thanos wanted the gems exactly to avoid doing that and make genocide efficient). Amongst those planets, one where he fights The Guardians of the Galaxy, including...Gamora, who should be dead or Thanos could have never got the Soul gem.
What If... Ultron Won? - S1-E8
Other mistake: Ultron exterminates the world population quite literally nuking the planet. Black Widow and Hawkeye survive because they are in the air during the global inferno (that's not really how it works) and for the rest of the episode they saunter about on a world full of the deadliest level of radiation in a nuclear winter (electricity and cellular phones work, too).
Other mistake: Dialogue when the heroes locate the base; "The beacon's location was corrupted in transit, we have no idea where it came from." "Well, it looks to me your message is in non-linear hexacode" "That location looks familiar, Agent Carter?" And Sharon instantly identifies it. It may make sense when you write it, but not when there's no pause between sentences and no 'location' is shown. From "We have no idea where it comes from" to "Does it *look* familiar?" through a non-sequitur. (00:08:00)
