No, it is the one that moves up and down if you are not on it, but if you are on it it falls. It is also the first different colored platform of level 2. I couldn't get a screenshot because the posting thing wouldn't let me :).
To get the bug, I was the biggest player, and I got it sometimes by jumping off the left block in the pic, spamming space before hitting the block, and then trying to hit space just as I hit the block. I think the bug stops happening after you get the bug twice, but I do not know. Doing this makes it somewhat easy to get after reloading.