Yes, we did see an increase in vote spoilage.
In Edmonton, in 1952, 9.1% of the ballots were rejected. That's huge. The reason is that in Alberta they had a rule that if you only wanted to vote for one candidate and you put an X by their name, that was considered a spoiled ballot. You had to put a “1”, and some people were voting federally and voting with an X. Manitoba didn't have that rule. If you put an X, it was clear that you only wanted to indicate one preference. So their rates of ballot spoilage were more like 1.5% or 1.6%, but it did drop even with that, after it came in. So yes, there was some ballot spoilage.
As far as improving proportionality is concerned, in Edmonton, Calgary, and Winnipeg, yes, they all performed much better and got much more proportional results—more so in Edmonton and Calgary than in Winnipeg. Winnipeg was very complex. There was a big spike in the number of small parties, but that had to do with the general strike. Saskatchewan conveniently provided a control case for us. They didn't do electoral reform and they saw a big spike in parties at the same time even though they didn't change their system.