Other mistake: The spaceship used by Kal El is very small for a 5 year trip - he'd need to eat something in that time too!
Suggested correction: Since we know nothing about Kryptonian technology, we can only speculate how or if supplies are stored.

Directed by: Bryan Singer
Starring: Kevin Spacey, James Marsden, Kate Bosworth, Brandon Routh
Other mistake: The spaceship used by Kal El is very small for a 5 year trip - he'd need to eat something in that time too!
Suggested correction: Since we know nothing about Kryptonian technology, we can only speculate how or if supplies are stored.

Continuity mistake: In the scene where Lois Lane is holding her son as Lex Luthor is revealing his plan to her the ring on her left hand switches back and forth between her middle and ring fingers. (01:25:05)
Superman: Your wrote that the world doesn't need a saviour. But every day I hear people calling out for one.
Question: Okay couple of Questions. 1) Superman Returns is between parts 2 and 3, Lex at the end of Superman Returns is left on possibly an uncharted island. How did Superman know what island to pick Lex up on so he can be put in jail for part 4 where he breaks out of jail? 2) What happens to Lois and Superman's or Lois's boyfriend kid since there is no reference to any kid in parts 2 3 or 4.
Answer: The film doesn't take place between II and III, it just carries on from Superman II, ignoring 3 and 4 completely. Think of it as a parallel timeline.