Witch & Wizard Card:
When done talking to Dumbldore in the beginning of the game, go up the stairs and turn left. Go forward to the door to the Griffindor tower. Then go down the flight of stairs and go where Fred and George are. Look left and walk straight up to where the thin bookcase is and press the Square
button. Then look around in the passage and you will find a famous Witch and Wizard card.
QuickJump in the Cauldron Room:
In the cauldron room there will be green stuff that you can't get into and the buckets are hard to get across. So, to get to the other side with the lever, hit Start (pause), hold L1 and hit Circle, X, Square, Left, Right, Down, then hit Start again. You will be on the other side of the green stuff. Type in code again to get back to where you started.