They look like Poetic Licence to me, they have Mary janes in three colors that seem to sum up the shoe usage in the movie but I have yet to confirm this, Im looking frantically too :)
here's the shoe im talking about: http://www.endless.com/dp/B001CSZSS8?tag=endlesscj-20&linkCode=asn
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like the bottom of hilary's shoes
Rockports
He wears supra,vans
Jonn Fluevog
Hodgman Lakestream wading boots Old version (rare and hard to find).