At the very end of the episode Faith, Hope, Trick, we see Buffy going to Angel's mansion to place her Claudaggh ring on the floor and say good-bye to Angel. But when she leaves, Angel is brought from hell and falls from the...sky, I guess and lands on the floor. If you look closely, you will notice that his tattoo that is usually on his right shoulder blade is missing.
You could just chalk it up to it being like a rebirth.
When he died, he clearly died with clothes on, yet he comes back naked. Coming back from that hell dimension, that could be why he has no tattoo, and why he doesn't seem to have any scars (I believe). Basically, it was like being born again.
Otherwise, obvious mistake. I prefer to go with the first reasoning though, has more meaning to it and works on a metaphorical level that "crew mistake" just doesn't.
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