I think it's really hard on the writers, because the fans' job is knowing the show, inside and out, and they really truly memorize the weirdest things. So I will cut them a lot of slack--it's very within the realm of possibility that they forget they even *mentioned* someone's birth date. Why would they remember? And part of the things that are inconsistent is because it just doesn't work, production-wise.

However, I agree on clothes repair/details like that. Maybe Apophis had the upgraded version of the sarcophagus? "New! With Insta!Robe Repair! Never Have to Change Your Clothes Again!!!"