Jor-El's voice repeats something from the first film, that "by the time you get to Earth a thousand years will have passed", meaning that while his aging will be vastly slowed, the journey will take a thousand years. Yet Superman goes there and back in five years of real time using the same technology. [This isnt mistake because he did not say Earth years. For all we know a year on krypton could be a half a day to them.]

When Superman brings the plane to a halt on the stadium pitch, the nose cone only buckles a bit. Surely, under the strain of all that weight it would have collapsed? [It's an established, if infrequently acknowledged, part of Superman's powers in the comic that he's often capable of lifting and otherwise manipulating objects that should crumble or otherwise collapse under their own weight without this happening. It's often considered to be a form of touch-based telekinesis that acts to enhance the structural integrity of the object in question.]

During the "brakes out" scene, Kitty tries to stop the car by turning the key, but it is broken and gets stuck in the ignition, so the engine can't be turned off. You can hear it going in the rest of the shots. But when Superman lifts the car, suddenly the engine is dead. [Superman stops the car before he picks it up. Forcing a stop that quickly would cause the engine to seize.]

After Superman lifts the car, the wheels are seen stopped, it was running fast with the brakes out so they should be still spinning. [Superman stops the car (thus stopping the rotation of the tires) and THEN lifts it.]

When Superman is lifting the miniature continent, the rock formation where his hands are positioned changes between shots. It goes back and forth from a rocky surface to a flat one. [Not surprisingly, because chunks of rock and crystal are continuously falling off of it while Superman is lifting it into space. No mistake there.]

In the scene where Superman saves the plane from crushing, we can see that both of the plane wings were torn away in the air, but when they land they miracously disappear. No debris of any kind follows. [Superman guided the plane to a safe location. The wings, and other bits, would have fallen more or less straight down. Of course there's no debris nearby.]

Superman's strength and other superpowers seem to oscillate a lot between scenes in the movie, and for no good reason. Towards the end of "Superman Returns", he is shown lifting an entire landmass out of the ocean, and pushing it into outer space, all while being exposed to Kryptonite. He is also capable of showing up anywhere in the world nearly instantly, as a reporter comments. Yet in one of the first action scenes, he struggles trying to catch up with a plummeting airplane, and has a hard time slowing it down, managing it just before the plane hits the ground. This should be a trivial task for someone of his abilities, yet no in-movie explanation is given for such poor performance. Of course, the real reason is obvious - the plot requires that Superman saves the day just in the nick of time, to create cinematic tension and resolution. [He is able to lift the kryptonite island because he just got supercharged by the sun. There's the "in-movie explanation" for that. As for the airplane: He was simply going only as fast as necessary to catch up with it. Then, while slowing it down, he was being mindful of the people on board. As mere mortals, they are subject to the laws of physics. Specifically: inertia. If Superman had stopped the plane too quickly, those people would have suffered the same fate as if he'd let it crash into the earth. There is an old Chinese proverb which Superman adheres to (as do most superheros): "Never use a cannon to kill a mosquito." In other words, Superman only uses as much of his power as he absolutely must to get the job done.]

When Superman is first flying toward the Genesis shuttle, a controller says an unidentified bogie (Superman) is approaching from the North, but the computer screens (one of which even shows a compass) indicate that Superman is apparently coming in from approximately the South East. [It is traditional but by no means compulsory to have north uppermost on a map or radar screen, and in orbit where 'up' and 'down' are meaningless concepts anyway the radar screen could be oriented any which way.]

In the scene where Superman is lifting the newly crated island to space, he stops pushing it, and the island continues into space. Then suddenly, as he looses weight and mass (because the island is gone), Superman falls down towards earth. If he does, so should the island. Alternatively, if the island continues into space, so should Superman. [Superman didn't simply stop pushing, he gave it a final heave that cleared it of earth's gravitational pull. Superman, however, was not clear of it, and having passed out he was no longer able to maintain flight.]

Why does gravity seem to be either on or off while on the airplane? Just leaving the atmosphere would not suddenly cause things to start floating as they do. [The weightlessness occurs when the plane hits the top of a parabolic arc and starts to head back down to earth. This is how they films zero-gravity scenes for movies.]

After Superman exhausts himself from lifting the kryptonite-encrusted island his cape can be seen waving. However, there is no air in space so it would not be able to move the way it does. [This is not an error. After he collapses, his cape is waving very slightly as he re-enters the atmosphere. As he continues to fall, the air pressure increases and the cape waves more violently. There is nothing factually wrong with that scene.]

In the scene where Superman lifts up the sunken yacht in order to save Lois and her family it shows when he lets go that he was holding that entire half of the ship completely out of the water with one hand. This is impossible, assuming that he was able to lift that much that spot on the ship could not hold that much weight without ripping away from the rest of the ship. [In the comics, Superman has frequently been seen to lift something that should really crumble or break under the strain without it doing so, entire buildings, for example, to the extent that it is an acknowledged part of his powers (described as a unconscious tactile telekinesis holding the object together while he's in contact with it) that this occurs.]

As the plane falls to Earth toward the start of the movie, there is no sign of re-entry heat being built up on the plane do to air resistance and air compression beneath the plane. [A plane would not build up enough speed or resistance to show signs of heat. A plane staying within the atmosphere would reach terminal velocity long before it was going fast enough to heat up from friction. The aluminum and titanium of the fuselage can withstand very high temperatures, with melting point not until the thousands of degrees fahrenheit.]

In the scene when Lois and Jason pull up in front of Lex Luthor's house, we are inside Lois's car, and Lois's window is up because you can see the reflection. However, when they show a shot of Lois from the outside of the car, you can see that Lois's window is down. [No when Lois pulls up to the house we are outside looking in through the passenger side window (hence the reflection of the glass). When she gets out of the car we see the driver's side and that window is down.]

How does Clark Kent manage to conceal a long, red cape in his suit? [How is the suit impervious to bullets? I'm sure that the suit and cape have 'special' abilities, one of which could be tucking it into his pants. Another one easily could be that it's extremely light and easily folded so as to avoid dection under a suit.]

An electromagnetic pulse (EMP), such as those caused by the crystal reactions, affects unshielded electronic equipment because it induces a voltage surge in their components, effectively 'frying' them. All affected devices are damaged permanently and would never work again, not even after a few minutes, as they portrayed to do so here. [Who said it was a pulse with the exact same properties as a nuclear EMP? For all we know, the wave simply saps out electricity.]

In the plane sequence the whole weightlessness is wrong. When the plane is high in the atmosphere the people inside it will still be under the effect of gravity (when the film shows no gravity) and then as it falls you would get effective weightlessness as everything falls at the same speed (yet the film has the gravity switched back on). [Whoever this twine guy is obviously doens't know his physics well enough. Should go read up something before putting something up here. http://en.wikipedia.org/wiki/Zero_Gravity_Corporation OR http://en.wikipedia.org/wiki/Vomit_Comet Zero gravity can be experienced in a plane which is on a parabolic curve, and that's exactly what happens to the plane. And you gotta remember that the plane had gone up quite high with the shutttle on its back.]

Lex states that the crystals just need water to grow meaning that the new land must be somehow made from water molecules. In that case the land is effectively solidified water, lifted out of the ocean, meaning the worldwide water levels would drop, not rise. None of the flooding could ever happen. [Just because the crystals grow when placed in water, doesn't mean the resulting structure is made from water. When you water a seed, the resulting plant is not made from solidified water. The crystal probably expands in size exponentially when it hits water.]

In the scene where Superman is taking the Daily Planet globe down to the ground, there is a shot of his face. In the background you can see the Daily Planet tower with the globe on top. [That is part of the building just above the front doors, not the actual globe itself.]

In the scene when Superman pushes the Krypton continent into space his cape still has drops of water. Water freezes at high altitudes and in space. [It was established in the first Superman movie, and mentioned again in Superman Returns, that Superman's body is quite warm, which is how he can carry Lois above the clouds without her freezing. The water is being warmed by his body.]