The bedroom arrangement constantly changes. You can see them use the bedroom near Maxwell's room for all three kids through out the series. You can even see Brighton going into Maxwell's room when being told to go into his own.
When people are leaving through the inner front door, they often turn right (exiting the stage) rather than going through the outer front doors. While not noticeable from side views of people leaving, his flaw can be seen from shots behind the characters as they leave.