To get stickers and decorations without getting the prize bubbles is easy: just take them off of the thing they are on so if you want a sticker or decoration you don't have take it off the thing it's on.
How to get stickers and decorations without getting the prize bu BUT the one you copied, you can walk through it. But when you play it the one you copied will now move. If you don't, then it disappears, Right? If you do Pause it, Then copy the Dark Matter, then place it, then Play it, then the other one will disappear, right? But the one you copied won't. (UNPROTECTED!!!) Then put it on the Dark Matter. Then get out some Dark Matter and then get out a Creature Brain.
The code is: UP UP DOWN DOWN LEFT RIGHT LEFT RIGHT X CIRCLE. Go to the machine and activate it and then do the KONAMI CODE.
Play "Set The Controls For The Heart of the Negativatron" and find the broken arcade machine with a sackbot repairing it.