well, first you have to go back to level 2. then, you go into the little space between the tree and the bush by the river. you come out into a treeful (if that is a word) jungle. about the sixth tree in, there is a headstone of some kind of indian. kick it and you unlock a key. the key will take you back to level 1, but will unlock 10 bonus levels that you can go to in any order. good luck! i was just kidding. ha ha ha! no i wasn't. seriously, it works. try it. ha ha. no, really.
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You must complete all of the bonus levels on each Place/Planet.
there is 25 levels + the bonus levels which there is 5 bonus levels
They are clips from the "Bonus Levels" which are in a separate room, available once you get to a certain point in the game (after earning a certain number of gold bricks). Beat the bonus levels (there are 6, one for each episode) and you'll have those clips unlocked.
you cannot unlock them you have to buy them on PSN or LIVE Marketplace
there are 25 levels + 5 bonus levels so there are 30 levels in total