Here is a list of all of the Green Capsules to be found in Disney Infinity's The Incredibles Play Set along with where they are and what they unlock.
There are several decorations and building textures found in Red Capsules that unlock items in the Toy Box, and several toys in the Toy Box that are unlocked only by purchasing the equivalent toy in the Play Set.
On top of building in northern part of town, south road west side of taller building with pole on top.
On top of building to the west of bridge going east. Jump from Vault.
On side of building to the left of the right bridge going north, jump up platforms.
On platform in front of billboard at north-east end of town, near pier.