The githyanki remind me more of the Alternian trolls from "Homestuck". Given the whole thing where they live their adult lives on the astral plane but grow up on material planets, they have psychic powers, they lay eggs, and they are rules by a sadistic queen with formidable supernatural powers
EDIT:
On an unrelated note, stuff owned by gnomish nobility has a tendency to be worn out and ratty but not look it. It starts out as nice luxurious stuff that is backed up and enhanced by illusion magic to make it nicer. Eventually the actually item wears out but the illusion remains so you wind up with stuff that's worn out and broken but still looks and feels luxurious
EDIT:
Also, at least some of the monsters that seem to be mashups of other kinds of creatures - such as the owlbear, the sphinx, etc. - are likely not related to the species they resemble (In much the same way that the Platypus isn't closely related to either the duck or to the beaver)
EDIT:
Also, the Slaad language sounds like the vocalizations from the "Crazy Frog" remix of Axel F