I understand about the Demi-human advancement. I'm glad you've allowed them to go beyond whatever the standard level limits are. I'm more used to AD&D, and I can say that my least favorite thing about 1E rules are the demi-human level limits. Also, the Ring of Protection +1 I mentioned in an earlier post appears to be working now, even tho I'm certain it wasn't giving the AC bonus before.
There was an area in which prior to each combat it gave a message seemingly indicating various different encounters. Something like 'Manticores attack' and then the next was 'Cockatrices attack', and so on - each indicating a different opponent. However, when the encounter actually came up, every battle in that area was against animated statues. The 1 exception was a battle with a medusa and some animated statues. I'm thinking this was in Mount Cayley, but I could be mistaken which area it was.