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Animals getting stuck in blocks and die.

Able to be pushed by mobs / players when taking damage

can extend rails over air with piston

Can duplicate blocks with fast firing piston

Blocks requiring any support block (carpets, signs) placed on piston head break when sticky piston retracts

Shulkers can be pushed outside of the world border by a piston

Flowers in snow pushed by a piston results in the flower being deleted forever

The player is pushed away when he is at the edge of a block of farmland, grass path or soul sand

When standing on certain non-full blocks, the player gets pushed off if there is a lower area next to the block

Endermen don't often teleport instantly when they fall into water