Continuity mistake: In Kandor, Superman punches a hole in the ground and picks up a large chunk of the street out of the hole, but does not move from that spot. The shot changes to the robot's perspective of him about to throw the rock and shows his feet. The ground he just punched and picked up is in perfect condition at his feet. No hole, no cracks, no sign of the damage he just made. (00:41:15)
Continuity mistake: Superman punches Brainiac in the face hard just before taking Kandor from his ship. Just before this, Superman ripped the cords and pipes out of Brainac's head, and so his head is covered in a black goo liquid. When he is punched out cold, his head and face are still covered with it. A little bit later when Brainiac awakens, his face is suddenly clean. (00:43:00 - 00:44:40)
Continuity mistake: During Braniac's attack on Metropolis, a few of his drones get inside the Daily Planet and attempt to go after Lois, Jimmy, and the other guy. They quickly shut the door and prop a file cabinet against it as a barricade. The one they push against the door has just two solid drawers on it. There are two more files cabinets with 6 drawers each next to the wall. Moments later, it is shown that there are now only 2 cabinets in the room, and the two 6 drawer ones are at the door. The 2 drawer one has vanished. It also shows the window blinds going from broken to fixed. (00:49:20)
Continuity mistake: As shown in the Batttle of Kandor flashback, when Brainiac's ship begins forming the shield around the city, the shield begins forming from both above the city at the ship, and at the ground around the city going up at the same time and the two haves meeting in the middle. Then when Superman is trying to break into the ship when he found it on an alien planet, Brainiac's ship begins the same process of the shield. One shot even shows the bottom half forming and moving up under Superman. But just a shot or two later from in front of Superman, you can see the ground of the city at the edge and there is no shield there. (00:24:40)
Chosen answer: If you'll notice, in order to change the trajectory of the missile, she blasts into it with her laser vision to make it vent and change its dynamics. This damage most likely is what caused the detonation by a chain reaction. Another possibility is that the missile was on a timer set to the amount of time it would take to reach the center of the sun. A missile designed to destroy a star in such a manner would obviously have an optimum effect from the very center. But the missile has to survive traveling through the star to get to the center, thus it would be made to withstand the plasma and heat to prevent impact or heat detonation. Thus it was likely timed.
Quantom X ★