When mob eggs are in dispensers, chests, furnaces etc.. and the block is broken from the outside the egg drop is messed up.
The spots on the mob egg drops are off the egg and it is left a single color.
Steps to reproduce:
1. Place a stack of mob eggs into a furnace, dispenser, chest.
2. Exit out of that blocks gui and break the block externally.
3. The dropped mob eggs will be messed up.
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I cleaned up the summary and description to be a bit more readable

Confirmed: Windows 7-64 Java 7U9-64, AMD Radeon 6700

@Grum: To reproduce:
Throw a lot of same eggs with Q
Leave the game
Reenter
Voila