Continuity mistake: When Perry White is talking to Lois about Clark not calling or emailing, Lois is reading the newspaper about Superman's death. She has it opened up fully. But after the camera shows Clark's computer, Lois still in the shot with the newspaper open, it cuts back to Lois and suddenly she has it folded over. (00:30:25)
Continuity mistake: Lois is reading a newspaper in her cubicle about the death of Superman, and there is a pencil on her desk on top of some papers. A few shots later when Perry White gets closer to her to tell her that Kent is probably fine, the pencil turns around facing a different direction, and the papers it is on move also. A stapler also suddenly appears next to her computer, and the brown book on the far end of her desk moves closer to her and turns around so the spine is facing the wall to Lois right and the pages facing her computer when it was the spine facing her computer first. (00:30:35)
Continuity mistake: As Perry White is telling Lois to go visit with friends or family to ease the passing of Superman, there is paperwork pinned to the wall of her cubicle behind her. It cuts to a close up of her face, and suddenly the paperwork at least doubles. (00:30:45)
Continuity mistake: After the scene in the Daily Planet where Lois and Perry are talking about Clark missing and that Lois should go see friends or family, it cuts to her driving down a road by large corn fields going to Martha Kent's house. She is driving with her right hand on the top of the steering wheel and her left arm hanging out the window, but with her hand and wrist propped up on the seal. It then cuts to a different angle as the car is driving by and suddenly her left arm looks extremely weird in some animation error. It appears it is just the elbow of her arm out the window, but that it has somehow merged with the door and she has become part of the car. Also her right hand is no longer at the top of her steering wheel and her head rest on her seat is suddenly not extended up as much. (00:30:55)
Continuity mistake: The curtains on the door of the Kent farm keep changing colors in the scene where Lois talks to Martha Kent at the door. Shots from behind Lois show the curtains a pale white color, but the close ups of Martha show them as red. And in the reverse angles from behind Martha, they appear a pale pinkish orange. (00:31:00 - 00:32:30)
Continuity mistake: Just before we see the TV broadcast of crime levels going up in Metropolis, we see a traffic light next to the electronics shop window. On it are Don't Walk signs, a One Way sign, and the street sign. Then as the camera pulls back when the thugs start stealing the TVs, the signs have vanished. (00:32:40)
Continuity mistake: As the camera is zooming in on the electronics shop, you can see the doorway and a welcome mat out front of it. But when the thugs break the window and start stealing TVs out of it, the doorway is barely visible, but the bottom half of it is now wall that connects the other sides, and the welcome mat has been cut down to a small little thing barely what it was. It then goes back to normal in the overhead shot. Also the building to the right of the electronics shop changes up in the overhead shot. (00:32:45)
Revealing mistake: An electronics shop has TVs on display, all showing a newscast about rising crime rates in Metropolis since Superman's death, and the window is broken by a brick as some thugs start stealing the TVs. Watch closely as they pull them out, the TVs have no power cords, but are on. Most noticeably on the second one when the guy has the TV lifted up, no cord seen, and yet the image still displays on the TV until he pulls it out of the window. (00:33:05)
Continuity mistake: When the thugs steal the TV's from the electronic store, the above shot shows where the TV's were but spots open on the self now do not match up with the TV's they took. They would not fit there as shown in the second shot. (00:33:10)
Continuity mistake: After Jimmy quits the Daily Planet, Lois barges into Perry's office demanding to know why and discovers that he is drinking. One shot shows him tip up his glass and drink most of the contents, leaving only a small amount with the four ice cubes. It cuts to Lois for a moment then back to Perry as he says to not sugar coat it, and now his glass is half full, when he nearly emptied it moments before. (00:33:50)
Continuity mistake: After Perry White says that Jimmy is weak and is not strong enough to hold onto his ideals, he turns around his chair and holds up his glass. It then cuts to a close up of his face just before he takes a drink and suddenly his fingers are holding the glass much higher up. (00:34:00)
Continuity mistake: In the scene where Lex kills Tess, several shots of his desk, most prominently the silhouette of him shooting Tess through the window, show that he does not have any computer towers under the desk. Yet later when Dark Superman is walking into Lex's office and he confronts him about being out of character, there are now towers under the desk. (00:34:35 - 00:51:45)
Continuity mistake: Before Lex shoots Tess, you can see there are two computer monitors on his desk. In the silhouette shot when he blows her brains out, suddenly the leg of the desk is much closer to the monitor on the right. (00:34:55)
Continuity mistake: As Tess and Lex are talking in his office about how Lex was cheated out of his winning strategy by Doomsday, the arm rests on his chair are square. But then when the camera pans back up after he shoots Tess in the face, the arm rests are now rounded and bigger. (00:35:00)
Factual error: Throughout the scene where Toyman is holding a school bus full of children hostage, the sides of the bus are shown several times. In no shot does the bus ever have a bus number or a stop sign on the side. It is required by law in the US that school buses have the stop sign on them that extends out to stop traffic when children are exiting. And all school buses do have numbers if they are in use for identification purposes. (00:35:20 - 00:37:40)
Continuity mistake: In the scene following Lex shooting Tess, it cuts to Metropolis PD surrounding a building. The camera pans up to show a school bus at the top of the building partly hanging off, and it shows the wall the wheel is resting on with no damage. It cuts to a close up and suddenly there is a lot of damage and hole in the wall where the bus' front wheel is. (00:35:20)
Continuity mistake: When Toyman first appears, he walks his spider mech down the side of the building and it cuts to a close up of him saying he won't share, and begins hugging some money up to his face with both hands. It then cuts back to an exterior shot of the spider, and you see that Toyman's hands are instantly down at his controls again. (00:35:35)
Continuity mistake: The school bus on the building has caused some damage, right under the front wheel. Moments later when Toyman appears and the goes to the top of the bus in his spider mech, there's less damage under the wheel. Also the front wheel goes from looking like a 5 point star to a 7 point star. (00:35:40)
Continuity mistake: After hugging the money, Toyman moves his giant spider mech back on top of the school bus and then tips it over the side of the building while threatening Metro PD to back off. He is using the left side of the spider to hold the bus, and the legs on the right side of the spider to stay on the roof of the building. You can see in that shot that 4 of the right legs are on the roof behind the small wall. But after a brief moment of cutting to Toyman's face, it cuts to show a shot behind the spider before Lois opens the door and suddenly the front most of the right legs of the spider is hanging off the building. When it shows the front view of the spider again, the legs are once again all behind the wall. (00:35:45)
Continuity mistake: Once the police begin driving away after Toyman's threats, the camera pulls back showing Toyman's spider holding the roof of the bus, and you can see the two legs are puncturing the top of the bus. It then cuts to a front view of this and suddenly the top of the bus is without a scratch, and the shadows on the roof of the bus move further down. (00:36:00)
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.