I think there's a reason that they are not showing us those rooms, and it goes beyond any behind the scenes stuff.
There are any number of ways that they could have filmed other rooms, regardless of where anything is being filmed, or whether or not they had the budget to outfit an entire room or whatever. They could have gone to someone else's house (surely the creators have friends) or used their own bedrooms or whatever.
This, of course, raises the point; But, if they did that, they'd have to film from those rooms all the time, so using someone else's bedroom would probably NOT be cool. But, consider this: First, they didn't have to have Jonas go to those rooms specifically. He could have said "Here's the living room!" and never filmed from the living room again. Also, they certainly could have shown the bedrooms and just not ever shot in them again. I mean, generally the characters all film in the same room, anyway. (Same room, meaning one room in their house or flat.) So, if B&D went to Jonas', my guess is that they'd probably mostly shoot in the library anyway. Or, maybe from just one bedroom, like Daniel's.
Point is, rooms COULD have been shown, and they weren't. Which leads me to believe that there is an INSTORY reason for not showing any rooms. Which leads me to believe that the house is bare, it is a trap, and B&D are going to walk right into it.
I can't wait.
Ah, for the good old days. 
