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)
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)
Continuity mistake: When Lois is sneaking up to the door of the school bus, you can see the front wheel appears to be one solid piece all the way around and in the spokes and center. But a bit later as she is leading the children off the bus, there are now gaps between the spokes and the center is hollow. The wheels change several times in this scene. Also the front bumper suddenly becomes elongated. The headlight is also missing from the first shot and reappears. (00:36:05)
Continuity mistake: After the police leave, Toyman moves his spider away from the bus and partly hangs off the building taunting the cops. It then cuts to a behind view of the spider, and suddenly it is much closer to the bus again, and is not hanging off as far. (00:36:05)
Continuity mistake: When Lois is sneaking up on the bus, you can see there are several pipes on the roof of the building they are on sticking up all around. But a little later when Toyman is lifting the school bus with the spider, the roof is visible behind it and the pipes are gone. (00:36:05 - 00:37:30)
Continuity mistake: Once Lois gets on the bus, the kids sit up and look at her. It cuts to a view of Lois, and behind her in the rearview mirror you can see the children reflected. Pay attention to the two on the far right of the reflection. It then cuts to a close up of them, not the reflection, and suddenly the little girl instantly has her hands over her eyes. (00:36:15)
Continuity mistake: Lois grabs one of the three red backpacks from the front of the bus and smacks the doll with it. The backpack then just completely disappears. It's not in her hands, it's not back on the hook, it's not on the floor, nor on the ground outside of the bus. It just vanished into mid air after she hit the doll and is never seen again. (00:36:25)
Continuity mistake: When the doll leaps at Lois with a knife, she grabs one of three reddish pink backpacks and smacks it into the window. The back pack she grabs is the one on the left, and as she grabs it you can see that the middle backpack has a rectangular shape on the front that is just an outline, and the backpack on the right has a similar spot but is round and yellow. Then when the children are getting off the bus, the remaining two backpacks are shown hanging there still and the one that was in the middle now has a yellow oval shape on the front instead of the rectangular outline. The design of the backpack is also different. Also in the shot just before this, the same spot is shown, but the backpacks are missing. (00:36:35)
Continuity mistake: Lois uses a backpack to hit the doll with the knife. It hits the windshield of the school bus and falls to the ground, glass all around it. When Lois steps on it to break it, the glass around it vanishes. (00:36:45)
Continuity mistake: After Toyman's spider slashes through the seats on the right side of the bus (from the bus' perspective), then slashes and hits the seats on the left. But in the immediately following shot, the leg of the spider busts through one of the back windows on the left side of the bus, and you can see the top of the back seats sticking up in view in perfect condition despite in the previous shot being cut in half. (00:37:15)
Continuity mistake: Once Toyman throws the bus off the roof, you can see the police cars on the street below and how they are arranged. It then cuts to a view from inside the buss at Lois and the little girl hanging on for dear life and out the back window of the bus you can see the police cars. Only the ones visible are not in any way like the patterns you could see previously. They rearranged themselves. (00:37:35)
Continuity mistake: Trying to kill Lois and the little girl, Toyman uses his spider mech to slice the seats in the school bus in half. But when Superman catches the bus and sets it down safely, the seats are just fine, not cut or damaged at all. (00:37:50)
Continuity mistake: After Superman apprehends Toyman, he sets down and the police lead the villain away. A cop walks up to Superman and says thanks, Superman turns and looks at him with a straight face. It then cuts to a close up of Superman's face and instantly he has a big smile on his face. (00:38:40)
Continuity mistake: A black cop thanks Superman as some white cops lead away Toyman. Then Superman lifts off to fly away and a shot from a different angle shows the black cop suddenly vanishes. (00:38:45)
Continuity mistake: After Superman rescues Lois from Toyman, he is flying her back to her apartment. She is marveling at how he could be back and places her hand on his cheek, with her wrist going over his chin as he frowns. It cuts to another angle, and suddenly her hand has moved back some and her wrist not over the front of his chin. And Superman is suddenly smiling. (00:39:10)
Chosen answer: When they call Doomsday a machine, they don't mean a literal machine. Just that he was built/designed. The comics were much the same. Doomsday was created by placing a baby on the most dangerous planet in the universe, and cloning that baby every time it died, forcing it to adapt. Doomsday eventually escaped this torture.
MasterOfAll