You are quite right Noob. # & quality of bathrooms plays a big part, as does size and quality of kitchen. Accordingly, fewer bedrooms in a house warrant higher P/Sq.ft.
Other considerations: Size of lot–small house on big lot raises P/Sq.ft. Single-story worth more than two story. This is a big factor in “bargain” prices P/Sq.ft. Temecula McMonster houses.