Hi Alan,
For such an auction house, I find these 'basic cataloguing mistakes' quite incredible. When it comes to furniture and most decorative arts, they are very choosy and go a long way to protect their reputation (in fact, they often give one the impression that it is an honour for your items to be sold by them.
But you are right, in my humble experience few auction houses catalogue weights properly.
Also, I find infuriating this habit of auction houses of sticking the lot number on the top of the dome, so that anyone without Superman's X-Ray vision has no chance of getting even a glimpse of the weight.
Oh! Dear! Do I sound like a grumpy old woman! I'd better quit...
SophieB