Double Dose - S2-E10
Factual error: Season 2 episode 10 "Double Dose": When Superman snatches Parasite's escape boat and hauls it back to Stryker's, Parasite attempts to blast him with a shotgun found aboard. But somehow the animators appeared unable to decide whether the gun should be a double-barrel or a pump-action type; and building a double-barrel pump gun would be impractical due to additional weight and bulk.
Fruit Picking Day/Daniel Is Big Enough to Help Dad - S1-E11
Factual error: Daniel's dad glues and screws the door bell button to Daniel's treehouse. He does not connect any wires to it or anything of the sorts, nor is there a power source to the tree house. Yet he pushes the button and the bell rings loudly. It is too small to house batteries or a speaker on its own. And the bell was electronic sounding.
Robo Koopa - S1-E52
Factual error: Koopa tries to kill the Mario brothers, Bunsun and Dr. Nerdnik by pushing an electric pole at them. Mario and Luigi use a nearby fire hydrant to protect them by having water rush out of it and keeping the pole from crushing them. There is no way a single blast of water can stop a large pole from falling, and the brothers would have been electrocuted as soon as the water hit the pole. (00:07:00)
The Seven Crystal Balls: Part 2 - S3-E4
Factual error: When Tintin begins climbing the tree to see if the intruder is hiding, he jumps up and grabs one of the tree branches. The branch is practically unaffected by the Tintin's added weight. There is no sound heard when the branch is grabbed hold of, nor are there any vibrations made to the branch when Tintin grabs it. (00:28:55)
Factual error: The forces of Cassiopeia all sport the crown-like "W" sign which is the shape of that constellation... but only as seen from earth! These five points in three-dimensional space (like all star signs named after anything) look like that when viewed from our own planet; but from anywhere else, they aren't shaped like that at all. Why would they chose to see themselves through a very specific angle of view from some other distant planet (earth)?
The Armor Wars: Part 1 - S2-E8
Factual error: When Blacklash and Blizzard have hijacked the airplane, all the passengers are wearing their oxygen masks, indicating that the plane is at a high altitude. When Iron Man crashes through the window of the cockpit to take out Blizzard, there is no corresponding depressurization. (00:12:59 - 00:13:29)
The Origin of the Silver Surfer: Part 3 - S1-E3
Factual error: When Silver Surfer is battling Galactus just outside the Earth's orbit, Surfer is depleted of his Power Cosmic and looks to draw energy from the sun to replenish it. The sun is pretty close to the Earth's orbit, when in reality it is 93 million miles away.
The Marriage of Lupin III - S1-E1
Factual error: The magazine roll with the various appearances of Rebecca has pretty solid Italian in it, but some headlines are phrased in ways that just don't work and would never appear on a cover, such as "Finalmente scoperto!", which would translate as "Finally uncovered", but with the wrong gender, and coordinating awkwardly with the following part. Also, they put a "The 10 best movies of the year" on a magazine called "Teatro", which is a word strictly reserved for stage play. (00:04:15)
Factual error: In s01e08, "Q and A", when Yelena is playing chess, we see her use the touchscreen which represents the chessboard. However, the bottom left corner is a white square when it should be a dark square. The board is orientated incorrectly, even though the board on the floor isn't.
The Alchemy Murder Case File 3 - S1-E8
Factual error: The Latin text on the supposedly old tome (which is written with a modern font) displays an alchemist diagram. It is a reproduction of a famous drawing meant to portray the Philosopher Stone in the Sylva Philosophorum, but whoever copied it does not know Latin, because certain words are misspelled ("Merceralia" instead of "Mercurialia", "Humides" instead of "Humidus"). (00:10:10)
Yomigaere! Eiyuu Densetsu - S1-E1
Factual error: When Seiya cuts off Cassios' ear, it pulses on the floor like it's a beating heart. There can hardly be a muscle twitch in a severed ear. (00:05:30)
Factual error: The map of the western United States shown during the weather report at the start of the episode shows some states drawn incorrectly. Idaho's entire western border is a straight line, whereas in real life, Oregon has a horn-shaped indentation on its northeastern border that it shares with Idaho. Idaho also looks like a crude staircase, with the southwestern border of Montana going down to central Wyoming, whereas that area in real life is around the northwestern part of Wyoming.
Factual error: When the X-Men are surfacing after crashing their jet into the dam, Shadowcat is shown phasing through the jet and pulling Wolverine and Beast through with her. Since Wolverine's bones are coated with a heavy metal, he wouldn't be able to float to the surface. He would sink instead. (00:14:57)
Factual error: Even though the show is called "Samurai Jack", Jack isn't really a samurai. The correct title for him would be a Ronin as a Ronin loses their master if their master dies or loses favor with their master and also has no home anywhere. Jack has these attributes. He has no master and no home.
Suggested correction: Nor is his name really Jack. "Jack", and thus "Samurai Jack", is just an alias that the prince takes. It's not meant to be his title or rank. Just like Cowboy Jack wasn't actually a cowboy.
What If... Captain Carter Were the First Avenger? - S1-E1
Factual error: In the intro, we are shown how Nazi Germany spreads across Europe - but after showing Denmark being conquered, it is shown to start spreading across Sweden. Sweden was never occupied by the Germans in WWII.
Suggested correction: I feel like this falls under the "Not a mistake because it's an alternate universe" umbrella. We're in an entirely different universe with a different timeline in this episode.
The show also makes a point that the only difference should be the minor choices or events befalling the MCU characters, and how these minor things have huge consequences for them, basically creating a new, alternate timeline. Basic world history before these events is not affected by the new timeline.
Suggested correction: The black spot spreading is not representing territory physically conquered by the Nazis, but more of their sphere of influence expanding. It is a steady spread and not a true representation of the war's progression. You can notice how Switzerland is also covered by the black, even though it was neutral during the war. Nor was Italy conquered, but their ally instead.
Michelangelo's Birthday - S3-E31
Factual error: The very beginning of the episode shows Michelangelo's Birthday circled on the calendar, and it is shown as the second Tuesday of the month as well as being the 13th day. The second Tuesday of a month can never be the 13th. The earliest the 13th of a month can be is the second Thursday.
Suggested correction: This is simply wrong. If a month starts on a Thursday, the first Tuesday will be the 6th, and the second will be the 13th.
Wax Doll Castle Murder Case: File 3 - S1-E9
Factual error: The culprit merely drops a chandelier from the ceiling in an unplanned move. From that simple action, the whole building - a huge castle - catches fire so quickly you'd think it's made out of papier-mâche soaked in gasoline, not stone.
Ruri chan 'Kôkai nisshi' - S1-E5
Factual error: The altar Yurika is doing a ceremony at contains Cyrillic writing that appears to be gibberish mixed with proper Latin words. (00:09:50)
Factual error: Dario Brando dies in 1880 (date on the gravestone) but when he was screaming at his son from his bed, Dio was reading "The Rise of Silas Lapham", which while being appropriate for his character, would be published only 5 years laters (started serialization in 1884).
Factual error: When people are dancing around the car that Daria and Tom are sitting in, the crescent moon is shown in the night sky in the background over the horizon, with the crescent facing upwards away from the horizon. This would be impossible as the crescent can only face down into the horizon at night (never away from it).