Are you talking about differences between Corollas made in the USA or Canada, or for the USA or Canadian markets? I'll stick my neck out and say that I'm pretty sure that Canadian owners are looking for pretty much the same thing in their Corollas as Americans -- they want a durable, reliable, and economical automobile that holds it's value. Therefore, there should be no difference between Corollas made for either market; in fact, you can just lump US/Canada into a single description -- the "North American" market.
Now -- there could be differences between Corollas MADE in US and Canadian factories, but that would be a quality control issue unique to each plant. It is my belief that Toyota does it's level best to minimize any of these differences. My first '01 Corolla was a "Canadian" -- and it was just as perfect as my present '03 "Japanese" Corolla. In some minor ways, I thought the '01 was, if anything, BETTER than the '03, particularly from the standpoint of the durability of the paint job. In the two years I owned it, the '01 never developed a scratch or a chip in the paint, whereas the '03 has several in the same time/mileage frame. My rear-view mirror on the right side has the paint completely worn off a small area due to some sort of abrasion, which I think may have occurred at a car wash. The finish on the '01 seemed "harder" if that's possible. I am now resigned to the fact that if I keep the '03 long-term, it may need to be repainted at some point. BTW, it's the "silver" color, whatever they call it -- "Lunar Mist Metallic" or something like that.
Has anyone else with an '03 - '05 J-Vin Corolla experienced any issues with the paint job?