Continuity mistake: When Clark sees Lex's building, there's no terrace anywhere, but when he arrives, a huge, wide terrace with an umbrella and plants around suddenly appears.
Sacha
Continuity mistake: Lois visits sick Clark and opens the door wide. When the angle changes the opening is much narrower.
Sacha Continuity mistake: When Lacy acts sexy in her office, Clark is about to enter through her door, but when the angle changes he's 15 meters behind walking towards the door again.
Sacha Continuity mistake: After Nuclear brakes the cab's hood, the opening width of the trunk changes between one frame and another in between angles for no reason whatsoever.
Sacha Continuity mistake: When Clark is in Lacy's kitchen watching Lex's message, the billboard underneath changes between shots.
Sacha Continuity mistake: When Superman lands with Lois after flying around, he says "You don't know my name." Right then her bangs swaps from messy and uneven to evenly cut and brushed.
Sacha Continuity mistake: Superman's X-ray vision cooks the raw turkey and then the shot cuts to Superman's face, when it returns to the turkey is perfectly cook and now has a skinny leg on the right side.
Sacha Continuity mistake: When Superman lifts Lenny and Lex's car up in the air, Lenny's hand is inside the vehicle, but a frame later it's outside and further back.
Sacha Revealing mistake: During the subway sequence, all of the train stations are always the same Metropolis South.
Sacha Continuity mistake: Nuclear Man breaks through the Daily Planet ceilings but his hair doesn't ruffle, instead it looks much better than when he entered the building. Superman's hair does ruffle and get messy and dirty.
Sacha Continuity mistake: The Russian cosmonaut who says, "Sing at home, Sinatra.", is floating relaxed inside the spaceship, a frame later he is crouched fixing some bolts.
Sacha Continuity mistake: When Lenny and Lex do the genetic experiment, the stuff on the table comes much closer together between the first and second shot.
Sacha Continuity mistake: In the barn Carl looks ahead to see through the walls to check who's coming. His POV shows a cart wheel, but when the angle changes it's been replaced by 4 stables. The wheel is on the far right hand side.
Sacha Revealing mistake: When Nuclear Man destroys Metropolis, one of the walls between the window shop wiggles and the tiles flutter revealing it's a cardboard set. (01:10:55)
Sacha Continuity mistake: When the volcano erupts, the village's main tower keeps swapping form lit to unlit between shots.
Sacha Revealing mistake: While Superman and Nuclear Man fall off the building and fight on air, they pass by the same parts of the building over and over again.
Sacha Continuity mistake: When Superman is being buried in the moon, the flag pole behind disappears between shots.
Sacha Revealing mistake: When Superman and Lois jump off the window, Lois passes by the same window over and over again.
Sacha Factual error: At the beginning of the movie we're told that the Statue of Liberty is in Metropolis. However, the subway billboard states that it's in New York.
Sacha Factual error: The Russians launch a missile which stands upright on a truck. The energy needed to send it beyond the atmosphere would need such a huge fire blast that it would've caused a big explosion when in contact with the truck's petrol deposit.
Sacha 
Answer: This is just one of many plot holes in the film. Whether she was at the edge of space or actually beyond the atmosphere, she shouldn't have had enough oxygen to remain conscious.
Jason Hoffman