Hogwarts Pre-DA:

• Pick up the Chocolate Frog (like in Any%)
• After the cutscene introducing Umbridge, cast up at the book in the corner

Go To Defence Against the Dark Arts:

• When getting the Gobstone, cast at the broken pile to get a Frog.
• In the Entrance Hall, in the screen that leads out to the Courtyard, there's a book you can cast at.

Go to Detention:

• After helping Myrtle, instead of going right when prompted, go down, and cast at a book.
• Then cast at a torch for a Frog.

Finding the Room of Requirement:

• When going down the Grand Staircase, you'll see a book on the way. Cast at it.
• Before talking to Neville, cast just above the pile of black stuff (burned leaves?) for a Frog.

Angelina Johnson and the Trophy Room:

• When Angelina calls for help in the Great Hall, cast at the broken pile to get a Wizard Card.
• In the Trophy Room, between the two sets of trophies you need to pick up, there's a broken pot that will give you a Frog when you cast Reparo at it.
• After escaping the Trophy Room, instead of going right when prompted, go down, and cast at a broken pile next to the stairs for a Wizard Card.
• In the screen after Colin, cast at a torch to get a Frog.

Luna and the Thestrals:

• In the Great Hall, cast at a broken pile on the right to get a Frog.
• When outside, after talking to Seamus, cast at a book at the top of the screen.
• At the end of the bridge ("Stone Circle"), cast at a broken pile for a Frog.
• At Hagrid's Hut, before talking to Luna, cast at a book.

Padma, Parvati and Hannah Abbot:

• 2 screens after the duel, there'll be a book you can cast at.
• A few screens after that, you'll be prompted to go left. There's a broken pile, next to the portrait, that you can cast at for a Wizard Card.
• After passing the Portrait, before going into the Library at the top, go down and go along that path. You'll see a book you can cast at.
• In the Library, cast at a chest on the left to get a Wizard Card.

Ginny and the Doxy Venom:

• 5 screens down on the Grand Staircase, there's a broken pile on the bottom right. Cast at it for a Frog.
• In the Entrance Courtyard, cast at a pile for a Wizard Card.
• On the Viaduct, cast at a torch for a Frog.
• Before talking to Ginny, cast at a broken pile next to the stairs for a Wizard Card.

Ernie Macmillan and the Potion Ingredients:

• 1 screen down on the Grand Staircase, there's a torch you can cast at for a Wizard Card.
• After talking to Ernie, go down-right. There's a hidden screen here with a Snitch you can cast at.
• On the Fourth Floor, cast at a chest for a Wizard Card.
• In that Fourth Floor area, rather than going down the lowest stairs to the Clock Tower Entrance, go right, as if going to the Hospital Wing. Near the Hospital Wing, go down, and keep going until you get to the screen where you got the second Wizard Card from Angelina's level (past the 'Quidditch knowledge' portrait). There's a Snitch you have to cast at the top of the screen to get.
• At Hagrid's Hut, go up past the Hut, into a 'hidden' screen where you can cast at a Snitch.
• In the Forbidden Forest Clearing, go up-left to another 'hidden' screen, where you can cast at a broken pile for a Wizard Card.

The Inquisitorial Squad:

• On the Grand Staircase, near the 'Daily Prophet' portrait, there's a broken pile you can cast at for a Wizard Card.
• In the Entrance Hall, on the screen that leads to the Great Hall, there's a broken pile you can cast at for a Wizard Card.
• At the Viaduct 'title' screen, there's a broken pile you can cast at for a Wizard Card.
• In the Potions 'title' screen, cast at a book at the top of the screen.
• After the cutscenes, go to the Trophy Room. In the Trophy Room, go down, down again, and down a third time so you can cast at a book.
• On the Fourth Floor, in the tower area left of the Hospital Wing, go to the left to another screen, where you can cast at a book.

Swamping the Courtyards:

• In the Great Hall, there's a Snitch you can cast at.
• At the bottom of the Entrance Courtyard (down from the screen that goes towards the Viaduct), there's a book you can cast at.
• At the end of the Viaduct, there's a Snitch you can cast at.
• Up the stairs at the Viaduct Entrance, there's a book you can cast at.
• In the Transfiguration Courtyard, there's a book you can cast at.
• On the Courtyard, there's a Snitch you can cast at.

After O.W.Ls 2:

• In the Common Room, go down a screen, go to the Blackboard, and complete all three challenges of all 4 lessons and both After School Games.
• Then start D.A. Meeting #11