Continuity mistake: As Lois and Superman are having their first argument about him telling her who he really is, there is a pink stone like thing in the room with them. They are standing in one spot in the scene, but the stone keeps moving around from shot to shot. Most noticeably at the beginning of their argument, and the end of it when she is walking away mad. (00:13:35)
Continuity mistake: As Lois is walking up to Superman from behind while they're both in red robes, she says "Look, I know who you are. Why can't you just tell me?" Superman's head is straight in that angle. But it cuts to a closer shot and his head is suddenly tilted to the side a little. (00:13:35)
Continuity mistake: When Doomsday looks up and sees a gas tanker driving by, it only has two lights on top of it. When it cuts to a close up, it has 4 lights on top. Also in the distance shot, the window and side view mirror on the passenger side are missing, but appear in the close up. (00:14:35)
Continuity mistake: As Doomsday is ripping the roof of the cab of the gas tanker, his mouth is open. It cuts to a close up of his face and it's suddenly closed. (00:14:50)
Continuity mistake: The driver of the gas tanker kicks around frantically as Doomsday is ripping him out of the truck and kills him. His foot goes through the driver's side of the windshield, shattering it. But the passenger side is unharmed because it is a separate window in this model of truck. The truck plows through the guard rail after Doomsday kills the driver and plummets to the ground, the passenger side of the windshield still fine. But in the shot of it just before it hits the ground, it is suddenly cracked as well. (00:14:55)
Continuity mistake: When Superman and Lois kiss to make up for their first fight, she has her hand on his shoulder, about an inch away from his neck. It cuts to a close up, and suddenly her hand has moved to being half way on his neck. (00:15:40)
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)
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)
Continuity mistake: On the bridge, Doomsday crushes the skull of a soldier with his hand. Burning rubble and debris are shown behind him. After one of the solders turns the 50 cal on Doomsday, another shot shows a red car suddenly appears behind Doomsday. The double yellow lines also suddenly vanish from under Doomsday. (00:17:10)
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)
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)
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)
Continuity mistake: Doomsday picks up a tank and throws it at a group of solders. There is a star on the back fender of the tank that is just the outline of a star. But when Superman catches the tank, the star is solid black. (00:17:50)
Continuity mistake: The tank Doomsday throws at the soldiers is damaged badly and the cannon is bent down, and very visible when Superman catches it and sets it down. But then after Superman freezes Doomsday, you can see the tank behind him, and the cannon is no longer bent. (00:17:55)
Continuity mistake: As Doomsday is running at a group of solders about to throw a tank at them, there is a black and white car beside them. Then after Doomsday throws the tank and Superman comes out of nowhere to catch it, the car turns brown, and an off orange van appears. This van also has no windows on the side. There also go from being 7 soldiers to 5. (00:17:55)
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)
Continuity mistake: When Doomsday is first charging at Superman, Superman begins blowing at him to freeze him and you see this as a shot from behind Superman. There are no cars in the street between him and Doomsday. But once Doomsday is fully frozen and Superman stands there looking at him, the shot switches to showing them from behind Doomsday, and suddenly there is a car and a van on the sides of the street. (00:18:05)
Continuity mistake: When Doomsday first charges at Superman the first time after Superman catches the tank, Superman stops him by using his super breath to freeze him. This freezes a very large portion of the street and cars in the street as well. But then when Doomsday breaks free and they start fist fighting, Doomsday grabs and throws Superman down the street. As Superman is getting up, the shot shows Doomsday charging at him again from the same spot that was frozen, only now all the ice has completely disappeared. (00:18:05)
Continuity mistake: After Superman and Doomsday first being their fight, Superman uses his breath to start freezing Doomsday. But the beast still walks towards Superman as he is being frozen. A shot of Doomsday's feet show he walks onto ground that is already covered in ice as his feet begin to freeze. But the shot cuts to a side angle and suddenly the ground Doomsday is on is not frozen. (00:18:10)
Continuity mistake: Once Doomsday is frozen, you can see that behind him where the tank is are a van and a car. But a little while later when Doomsday throws Superman down the street, Doomsday charges Superman and you see the tank and the van behind him, but the car has vanished. (00:18:20)
Answer: In the comic book, Doomsday was put in a strait-jacket, strapped in metal bondage and placed in a cube like metal prison buried deep in the earth. It took him centuries just to break the bonds, then spent more centuries just punching his way out. With earthquakes, volcanoes and other natural disasters those events could shift Doomsday's prison to the surface.