Fuyutsuki (OFF):“As we predicted, it's regenerating itself.”
Woman (OFF):“The data on Casper's status is being copied to Melchior. Please hurry with the inspection operation.”
Reichu: Odd — more of the second face was exposed earlier, in C-099 . And where did that thick ribbon of flesh come from?
HeWhoPostsStuff: Maybe he borrowed some of Misato's packaging tape?
TheAtomicWaffle: I was always it was part of the Angel's regenerative process. The fact that it isn't there later might well be a blooper.
Reichu: I thought perhaps the fact that it was there in the first place might have been a blooper… After all, the new face is trying to emerge, so it wouldn't make much sense for new skin to be growing on top of it. That's how I see it, anyhow.
Note in the supplemental dialogue here the first mention of the MAGI supercomputers, which we basically don't learn anything about until episode #12.