Hello Mojang,
my English isn't so good, but I hope you can understand what I mean.
I recognzied, when you put one Whopper on another an build next to the higher one an comperator and next to this 2 pieces of redstone and then anredstone torch, which is powering the whopper below, the whopper below still gets items, even when the the stack size is under 18.
I hope you understood.
I created that thing 10 times, but only one works right.

And the Textures when you destroy redstonedust and a door are wrong.

There is also another bug with Dispensers in 1.4.7:
I build two dispensers, but the crazy thing is, one spends lava when it get the signal ON, but the other one spends lava, when it gets the signal ON or OFF!