See if you can catch these mistakes when viewing the episode. It helps if you have it recorded on a DVR or VCR and can do rewinds, slow motion and single-frame advance:

Continuity error: During the phone conversation at about eight minutes, when the two men who are competing for the Egyptian box are talking, the clock in the background initially says 12:20; but a few seconds later, after they cut away then cut back, the clock now says 4:40--a difference of four hours and twenty minutes.

Factual mistake: At about 24 minutes, when Kent walks into Perry White's office, he says he's just visited Dr. Wilson. But the doctor's name is Anderson (it's on the doctor's office door).

Character error: At about 24 minutes, when Kent walks into Perry White's office, he says he's just visited the doctor, who now has the antidote that Superman flew to Egypt to procure. But Kent didn't see the doctor; it was Superman who saw the doctor. If anyone ever checked up on his story, they'd realize that Kent is Superman.

Equipment visible: At about 25 minutes, when they show a close-up of Superman while he's flying, two wires can clearly be seen holding him up.