Continuity: The Hoover Dam breaks in many pieces with huge cracks everywhere. When Jimmy is hanging about to fall, from his POV there are just four tiny cracks.

Revealing: On the Golden Gate bridge, the beetle car that skidded a split second before appears totally empty when the van crashes against it.

Continuity: When Jimmy is rescued by Clark in the Hoover Dam, Jimmy's hair during the flight is way longer than when he was hanging.

Continuity: After Jor-el talks to Von-Dah he places his hands on a man's chest. In the following shot they're on his shoulders.

Deliberate "mistake": Before the school bus crashes, a brown car is seen coming. When the angle changes we still see a brown car but it's a totally different model.

Continuity: In the gas station, the "closed" sign falls down but appears up in the next shot (you'll find it in the right side of the screen).

Deliberate "mistake": Before Superman traps the black missile, its beam is really big and covers half of the lettering on the side. When Superman is behind, the fire is much smaller and the lettering is visible, allowing us to see Superman.

Continuity: Perry White shows newspapers with day shots of Superman, but he made his appearance at night.

Continuity: When Lois falls from the helicopter, the cable holding her is visible.

Continuity: When the burglar falls from the building, his flashlight is sometimes swinging, but other times it's flat against his body revealing the camera was tilted.

Continuity: When Lois is hanging from the helicopter, she looks down and sees some cars on the pavement, by the entrance of the Daily Planet. From a ground view the cars are gone.

Continuity: When Lois dies, Superman's face is covered in dirt. When he takes off and flies, it's clean.

Continuity: When the gas station falls down, watch the right side: A green car with an open hood suddenly gets replaced by a red car.

Continuity: When the school bus smashes the Golden Gate fence, the aerial shot from the back shows the fence complete, the shot from the front shows it smashed.

Continuity: When Lois dies, the first time Superman sees her the left side of her face has sand and rocks around her cheek. When the angle changes they are at shoulder level.

Continuity: When Superman avoids the train from derailing, the wide shot shows his cape fluttering but the close one not.

Continuity: When Superman moves the school bus away from the void, the wide shot shows a different fence and wreckage, with a long piece of fence missing. The close shot shows a missing space that is slightly bigger than the bus.

Other: On Perry's office, there's a painted sign on the glass that says "Editors Secretary". Being the Daily Planet such an important paper, and with Perry White so picky on grammar mistakes, someone should've noticed that an apostrophe is missing.

Audio problem: While flying with Superman, Lois falls down and starts to shout. When he grabs her, her mouth closes slightly and her expression changes, but the loud crying continues.

Continuity: When Superman saves the wrecked plane, from the outside shots the window has droplets of water, but from the copilot's POV the glass is clean.