Update [11/8/2014]: Finally found all of the collectibles (83/83 cans, 13/13 birds, 10/10 gophers). The cans are ridiculously difficult to locate. I ended up tapping on each scene inch by inch to systematically search for the cans. The last few ones I found were ALL ENTIRELY AND COMPLETELY hidden (regardless of panning or tilting) so that even the slightest hints of sparkles were obscured. Fun puzzles. Not fun pixel hunting.
What the heck is this pixel hunt for cans? Some of the ones I found are so ridiculously well hidden to the point that they are just unfair. Since the locations are entirely arbitrary, the pixel hunting is meaningless and necessarily frustrating.
Also, can someone explain the IAP in this game? In Episode 1, the IAP are just hints. In Episode 2, the IAP descriptions are different. Are they the same?