I've spent the last couple of months watching the last hundred episodes on youtube. Meridian stopped showing it well before the end and I'd moved to the Granada area who had finished showing it years before so wouldn't have seen it anyway, so I never knew what happened.
I have to say, the production values were always a little low but the last year seemed to be especially bad for questionable acting and wobbling walls.
I've watched it through to the end and not seen anything you mention. However, I have seen wobbling walls in "Fawlty Towers".