Imperial Room was not Egyptian theme as I recall it.
Sort of Americanized Continental-French of that era (early 1970's, when I was there).
Plush booths, plus tables in the center ... a bit like Michael's at South Point, though my recollection is hazy.

On the menu were some French dishes, including escargot, etc.
But also steaks, shrimp cocktail and items for the American palate.
I recall a table-dressed salad, where they spin the bowl of lettuce while adding the dressing. Very 1970's !

I only ate there twice, both in the company of my older brother & family, when he was comped at the Hilton.
I was a broke college student at the time, so it was not in my league!