On arrival on our inbound flight, the luggage conveyor stopped working and had to be restarted, causing somewhat of a delay. This may be a symptom of other problems.
A number of the cases on the conveyor had handles that were either missing or merely partly torn off. I've never seen such a battered set of luggage, and this was on a flight inbound from London, so I don't think we were looking at third-world bags.
On our case, the address tag on our main case was broken by the time we retrieved it.
On our return to Montréal, landing from Vancouver, the extensible handle on our main case refused to extend. Closer examination shows that the tube inside the case, down which the handle shaft slides, had taken such a severe impact that it had buckled, trapping the shaft in place.
Now, it's possible that none of this damage occurred at Dorval. But I'd lay odds that the one common factor was in fact the problem, and that the inbound luggage system there is uncommonly brutal to luggage. In future, we might want to invest in some tougher cases before returning there.