Out of curiosity more than anything, are there any more logic clues in this thing?

Stuff like...
In anterior regard, quite absent,
Yet present, attending interregnum
could be seen as something to do with a letter (or letters) being absent from "anterior regard" yet present in "interregnum" - in such a case, u and m. The letters in those two phrases/words just seemed extremely similar.

These are the dumb little things I notice when actually bothering to read through the riddle for the first time. I learned me some new words today, I did.