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Trivia: The Fleischer brothers were at first reluctant to take on making this series. This is because that it would require a much more realistic design and style of animation than they usually do. Trying to discourage Paramount from giving it to them, they said they would need about $100,000 per episode, approximately four times the budget of most Disney films at the time. To their shock, Paramount agreed to give them half that, which has made the classic Superman series, accounting for inflation and adjustable dollars, the highest budget animated series in history.

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Continuity mistake: Cyborg attempts to hack into one of the freeze ray satellites and is stopped by Captain Cold, who freezes Cyborg. Once frozen, you can see that Cyborg is completely encased in ice from head to toe, fingers and all. But moments later as Batman is flying by in the Batwing, he looks over and sees Cyborg frozen, and in that shot, Cyborg's left hand is not frozen and protruding from the ice. Then when Batman goes to free him, Cyborg is fully frozen again.

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Plot hole: When Karate Kid accidentally frees Lex Luthor from the ice in the future, Lex just hops up with no problem and starts walking around perfectly fine after being frozen solid for 1000 years. Yet when they go back in time and then later free him from the same ice in the past, Dawnstar has to revive him so he can get up, and even after being revived, he is weak. Yet in the future, he came out of the ice perfectly fine and stole the Time Keeper. (00:11:10 - 00:37:20)

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Plot hole: Once Time Trapper has been stopped by Dawnstar and the time vortex in the sky stops sucking things up, everything in the air just hovers unmoving completely. Except for the people. Somehow Batman and Robin and Superman are able to move around just fine in the same time and gravity frozen place, Robin even jumps from hovering rock to rock without them moving. In fact, as soon as the sucking stops, the tree that Karate Kid is hanging onto stops moving and does not fall, but gravity somehow instantly affects Karate Kid and he almost falls off the tree and has to catch on again. It makes no sense at all for the objects to be affected and stand still and the heroes to not be.

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Continuity mistake: Karate Kid gets angry with Dawnstar for her calling him by his real name and tells her they must stick to their "Super names". Dawnstar then looks away and says, "Well Karate Kid " and she is looking to her right away from Karate Kid who is to her left. But then it cuts to a distant shot from behind and suddenly she is looking to her left, right at Karate Kid. (00:09:10)

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Continuity mistake: After arriving back in Metropolis, Superman first tries to defeat Doomsday by simply blowing on him to freeze him. You can see that he is standing almost right next to the tank he just sat down when he is in the process of freezing Doomsday. But then once Doomsday has stopped moving and is frozen, the shot cuts to a different angle and suddenly he and Doomsday are much further away from the tank, and somehow trees behind Superman are half covered in ice as well. (00:18:20)

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Continuity mistake: Doomsday throws a tank at a group of soldiers, and Superman swoops in and catches it just in time. He slowly sets the tank down and there is a black star on the back of it. It cuts to Doomsday sprinting at Superman, then cuts back to Superman as he is about to inhale and blow at Doomsday to freeze him. Now the black star has vanished. The damage and shape on the tank's cannon also slightly changes, the wheels on the tank change as well as the tracks. And the red van next to the tank is suddenly further back. (00:18:00)

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Continuity mistake: Doomsday charges a tank and picks it up, throwing it at the tanks behind it. You can see as Doomsday picks up the tank, they are in the middle of a straight stretch of road with no other roads intersecting close by. But as the tank lifts into the air, the camera cuts to a side angle and suddenly the other tanks are sitting right in the middle of an intersection. And the buildings around them also change a lot. (00:17:30)

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Continuity mistake: After the soldier in the tank fires his .50 cal at Doomsday, the tank turns its cannon at him and fires. Behind the tanks you can see the guard rails of the bridge extend far into the city, showing they are still high up. But then when Doomsday charges the tanks the railing is shown stopping as they are at street level now. Also the city behind them changes up. (00:17:25)

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Continuity mistake: After Doomsday crushes the skull of a soldier, a tank rolls onto camera and another soldier begins firing the .50 cal gun at the creature. It then cuts to a close up of the soldier from his front and the position of his left hand changes. From being on the side of the gun, to being on the top of it. (00:17:10)

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Continuity mistake: In Metropolis on the bridge, Doomsday grabs a soldier and breaks his neck and skull. In that shot, the soldier's arms are inside Doomsday's hand and his hair is a light brown or gray. But then when the shot changes as Doomsday begins to throw the soldier to the side, the soldier's arms are suddenly outside of Doomsday's hand, and his hair is now black. (00:17:10)

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Factual error: After dealing with the workers in the tunnel, Doomsday gets to the surface, kills all the Applecore workers and destroys their equipment and vehicles. Fires are everywhere from explosions and men scream as Doomsday crushes them. Once he finishes off the last guy, he walks a few steps away from the destruction and sees a deer just haplessly grazing on some grass nearby, only a few yards away from the Project Applecore. Only when the deer sees Doomsday does it decide to stop eating and take off running. Deer are afraid of loud noise. The explosions and men screaming only a few yards away would realistically have spooked that deer and just about any other wildlife in the area to run away. (00:11:15)

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Continuity mistake: When Doomsday is on the bridge in Metropolis, he causes lots of destruction there with fire and death. Moments later, Doomsday charges at a tank and punches the missile that it fires at him, blowing it up. The camera pulls back and shows the bridge behind him, with no fire or smoke or anything that was there previously. (00:17:20)

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Continuity mistake: After cutting through Black Manta's gun, Aquaman then slams Manta in the face with his trident and knocks him down. As he is twirling his trident in victory, you can see his belt and its design. But then it cuts to a close up of Aquaman and suddenly his belt changes in design with the bar in the middle disappearing and the black of his pants extending further up onto his orange shirt in the belt area. (00:03:50)

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Continuity mistake: Once Doomsday makes it to the surface, he spots a deer and it is shown from over his shoulder. It cuts to a view of the deer from Doomsday's eyes and suddenly the deer has moved over some, and the rocks and grass around it have changed. (00:11:30)

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Continuity mistake: The robot at the Fortress of Solitude has black arms, including most of the shoulders except where the pivot joint is visible. But for one shot when Superman is saying he wants to be more than Earth's resident strong man, the robot's shoulder is solid silver color like its torso. (00:07:55)

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Continuity mistake: When the laser drill is first shown at Project Applecore, you can see a protective bumper like thing on the front of it colored black and yellow in the caution stripes. Two scenes later when it is shown again as the workers decide to breach the spacecraft, the bar has changed. The lines being thinner and more of them. It also appears to be a perfect rectangle the second time whereas it was lopsided the first time. (00:05:20 - 00:08:50)

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Continuity mistake: After Superman fails his experiment to cure cancer, Lois walks up wearing just a towel and holding a smaller towel, drying off from a warm bath. It cuts to a different angle and suddenly the parts of her hair draped over the front of her shoulders down her chest are shorter, and the ends of the hair go from a single point to being forked. Her grip on the smaller towel also changes, her hands closer together, and her mouth is suddenly open when the shot changes. (00:08:10)

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Continuity mistake: After Tess walks in, Lex turns and begins pressing buttons on a small hand held device. There are three green lights at the top. When the angle changes, suddenly the lights are smaller and his grip on the device changes. (00:06:45)

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Continuity mistake: When the laser drill at Project Applecore is first shown, it has open wheels. But once the workers discover Doomsday's ship, the laser drill is seen backing up, and suddenly it has fenders. (00:05:25 - 00:06:20)

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