Thanks for finding that for me. It's too dark to see that wall in that pic and I'm sure there was another that showed it in light. The part you're calling a mudroom would require a set of stairs to go down to the garage level and with a flat roof like the garage has I can't see the headroom for stairs there. I'm not saying it isn't possible though.
I have to get moving and get to town or I would get right on finding the pics I was thinking of or other clearer views of the interior. You can easily beat me to it if you want to! ;^)
Go to 186 and look at the picture. There is a portable light on top of the car shining brightly on the wall. From this angle I can see no door into the house.