GREAT!!
My wife and I went to Venice, but the only LC location we were certain about was the library.
Excellent comparison.
Three things stood out to me -- early on how the yellow and red facades were much more muted in LC than they are now. I'm sure they've been painted since, but it seems the time of day and shadows made a big difference, too.
The library also looks like it's been spruced up considerably since LC. I can't imagine they let the film crew dirty it up temporarily for the shoot. Doesn't look like it was done in post, either.
Also, early on, across the canal, I like the look of the buildings better in LC. Most of that area got a heavy whitewashing since.
Very interesting. Ahh, Venice.