Continuity mistake: When we first see the old woman with her cat stuck in a tree, it's a higher angle showing the cat. This shot shows the cat is near the center of the tree on the left side of the tree, right where the tree splits off into two even sides. But then it cuts to a close up of the cat, and suddenly the cat is further out on a much smaller branch, and now on the other side of the tree as can tell by the way the limb is shaped. (00:49:55)
Continuity mistake: In the overhead shot of the cat in the tree with the old lady, you can see the small stairs behind the lady with nothing beside them but a tree. It cuts to the cat in the tree then to the lady, and suddenly two trashcans appear beside the stairs under the window. The tree is not big enough to have covered both of them up in the previous shot. (00:50:00)
Continuity mistake: When Dark Superman is confronting the old lady about letting her cat out, police cars drive up and spotlight him. Dark Superman's shadow is cast on the wall beside him, and on the small balcony. But when the camera angle changes, his shadow is on the bricks, not close to the balcony. (00:50:45)
Continuity mistake: When the police show up to try and arrest Dark Superman, the overhead shot of the cars spotlighting him show him by a building, but approximately 10 feet away from it, give or take a few. He is also about 5 feet away from the old lady. Then when the cops get out and walk up, it shows Dark Superman again from a different angle, and suddenly he is only a few feet away from the wall, moved closer to a balcony like thing, and is now just a step away from the old lady. (00:50:55)
Continuity mistake: When the real Superman is in the solar chamber going through accelerated absorption of solar energy, there is a giant, dormant robot to the right of the chamber, and Superman is on the left side facing it. A few shots later, suddenly Superman is on the same side of the chamber as the giant robot and has his back to it. Then in the very next shot, Superman is instantly on the left side again facing the robot. (00:51:30)
Continuity mistake: As Dark Superman walks into Lex's office, Lex turns his head sideways and looks at him as he says "Well... The piratical son of Krypton." It cuts to a close up from a different angle and suddenly Lex is looking straight forward. (00:51:40)
Continuity mistake: As Lex is telling Dark Superman that he is acting out of character, his desk is clear. Then while they are talking, a paper suddenly appears on his desk that he gives to Superman. (00:51:55)
Continuity mistake: Lex holds up a piece of paper with a list of Lex Corp competitors to tell him to search for Superman's body. You can see the arm rest on the chair and him sitting in the chair. When Superman steps forward to take it, the angle changes and suddenly the drawing of Lex is off, appearing to be sitting on his arm rest. Also his fingers change in how he's holding the paper, and the position of his right arm and hand on the desk change positions. (00:52:00)
Continuity mistake: When Lex is giving Dark Superman a list of Lex Corp competitors, there are two computer monitors shown on his desk. Then after Dark Superman is walking away in an over head shot, suddenly there is only one monitor. (00:52:10)
Continuity mistake: As Dark Superman is walking down the street, he looks over and sees La Fantastique Salon which has a blue awning over its window. The awning having a pattern of blue alternating between light and blue. When he first sees it, the end of the awning by the door is the dark blue pattern. It then cuts to a different angle and suddenly the end is the light blue one. Also suddenly he is holding the paper in his hand higher, and the brick pattern on the wall changes slightly in relation to the door. (00:52:40)
Continuity mistake: When Dark Superman stops by Le Fantastique Salon, he stops right by the door. Then he tosses the list Lex gave him in the trash and goes inside. But he has to walk a couple yards to get to the door, despite stopping right by it only a moment before. (00:52:45)
Continuity mistake: When Dark Superman goes to the door to the salon, the door has on it the number 932. He opens the door in, and it swings to the right. But it cuts to an inside view and suddenly it is swinging it to the left, and the font of the number has completely changed. (00:52:50)
Continuity mistake: Once Dark Superman opens the salon door, the ladies inside all stop what they are doing and look at him in shock. The camera shows especially this one girl with blue hair working on the hair of a black girl and they face their left to see Superman come in. But once Superman starts walking in, suddenly they are much closer to him and they are facing the opposite direction as he passes by. Also the arm rest the black girl is sitting in suddenly disappears. (00:53:00)
Continuity mistake: As Dark Superman walks from the door of the salon to an empty booth, he walks in a straight line and passes two mirrors and booths where people are getting a haircut. When it cuts to a different angle, there is only one booth behind him. One of the ones he passed has vanished. (00:53:00)
Continuity mistake: As Dark Superman begins sitting down at a mirror in the salon, there is a green bottle on the desk with a black cup next to it. Then after he sits down, the black cup suddenly becomes a red bottle. (00:53:05)
Continuity mistake: When Dark Superman is digging the led ball out of his brain with some scissors, the lady with blue hair faints and falls over. After Superman gets up and walks past where they are, the lady is suddenly gone. It cuts to a view of Superman's feet as he walks, and suddenly the blue hair lady is there again on the ground with a black lady and a redhead suddenly appearing on the ground helping her. (00:53:45)
Continuity mistake: Just before Lois makes her presence known to him, Lex is shown in an overhead view in his office looking out the window. There is a desk to his right and his left a few feet away from him by the windows. It cuts to a side view of Lex's head and suddenly the desk to his right has vanished. (00:53:55)
Continuity mistake: Once Lois makes her presence known to Lex in his office, the camera pans over to show her standing in his double door leaning against the wall. In this shot, the left side of the door is closed and the right side open with her standing leaning against the right side door frame. But then it cuts to a close up of her and pans up, and now the left side of the door is what is open, and she is leaning against the closed right door. (00:54:00)
Continuity mistake: After Lex realizes Lois and Superman were lovers, he sits down and tries to seduce her and says "You need someone to take his place... Someone strong." He places his hand on her chin to turn her head. Between shots and the close up, her lips are closed, and then suddenly open showing her teeth. (00:55:10)
Continuity mistake: Once Lois and Lex begin to kiss, Lois puts her arms around his neck and back with her left arm going up to his shoulder. It cuts to a closer angle after half a second and suddenly you see Lois lift her left arm up again to his cheek. Also Lex's thumb instantly changes position. (00:55:20)
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