Although they cast Expelliarmus and deduct ten house points, you can cast combat spells at teachers.
Climbing invisible poles
If you know Reducto, go to the Owlery. Go to the top floor. There should be poles or pieces of poles around the floor. Cast Reparo on one of the sets of pieces. Climb it, then go down again. Cast Reducto on the pole. Although it is broken, it is still climbable.
Defeating Voldemort
When playing as Dumbledore fighting against Voldemort, do not try casting Levicorpus or Petrificus Totalus as they do not work against him. When Voldemort is on the platform the first time, you can only hurt him when he unleashes his stored power at you. Use Protego to deflect his magical blast.
Dialogue
Sometimes when you are in the Transfiguration Courtyard, you may hear someone say, "Want to practice Charms? I'll meet you in the courtyard near Transfiguration." This is odd because they are already in the "courtyard near Transfiguration".
Finding Luna's belongings
One of her items is in the Viaduct entrance next to the bookshelf and the stuttering portrait. Another one is located in the Courtyard before the covered bridge directly in front of the fountain.
Flying Creatures
The following flying creatures must be found for the Room of Rewards.
Crows are at the Stone Circle.
Doves are at the bridge at the Viaduct.
Pixies are in a desk in the Defense Against the Dark Arts room.
Seagulls can be found at the boathouse.
Bats are below the Stone Bridge. Go to the Stone Bridge and light all the torches with Incendio. Then, climb down the pipe shown and maneuver your way to the bottom. You will discover the bats.
Game Boy Advance Harry Potter And The Goblet Of Fire reference
When you are in the Paved Courtyard, you may hear notes being played. They are the same notes from the Erkling's flute from Harry Potter And The Goblet Of Fire on the Game Boy Advance.
Herbology discoveries
In the Herbology classroom, walk into the room with four flower pots on a table. You will see a bucket hanging on the ceiling above the dancing water can. Wingardium Leviosa the bucket and let it hover over each of the pots. It will pour dirt into them. Then Wingardium Leviosa the water can. Hover it over each dirt-filled pot until it spews water on them. Spikey-plants will grow. You will receive Discovery Points. Then, go to the entrance of the Herbology room. Walk forward into the dead-end hallway directly in front of the door in the classroom. You will see a rope hanging up in a corner. Use Accio. It will air out the room and give you Discovery Points.
House Ghosts
To reveal the House Ghosts needed for the Room of Rewards, find the fallen portraits throughout the Hogwarts corridors. Use Wingardium Leviosa to hang them back up on the wall. The Bloody Baron's portrait is in the Dungeons. The Grey Lady's portrait is near the library on the second floor. The Fat Friar's portrait is on the first floor near the exit to the Stone Bridge.
Howlers
When you ascend or descend the steep, narrow staircase that connects the Dungeons to the Viaduct Entrance, you can hear howlers being played.
Levicorpus
When you cast Levicorpus, Harry (or Sirius/Dumbledore, depending on which point in the game you are at) may shout the name of the charm. However, in the books, Levicorpus (and its counter - Liberacorpus) are non-verbal, so your character should not shout it.
Luna's lost belongings
In the Clock Tower Courtyard directly in front of the Fountain.
In the Entrance Courtyard. Use Wingardium Leviosa on the broom and sweep the leaves on the right side of the courtyard.
In the Great hall on the table.
In the Library on the table.
In the Viaduct Entrance in front on the bookcase next to the stuttering portrait.
Ron and Hermione
Note: This can only be done after the task in which you help Colin at the Owlery. Climb up the pole next to the stairs that the Devil's Snare blocked before. Maneuver along the wall until you reach the first window. Jump inside. Ron and Hermione are not there. They are still outside watching you, but when you exit the Owlery, they will come out of the door directly behind you and are no longer standing by the pole.
Room Of Rewards trophies
Complete the indicated task to unlock the corresponding trophy.
Trophy
How to unlock
Characters Cup
Meet all 58 characters in Hogwarts.
Defence Against the Dark Arts Cup
Cast all defensive spells in six duels.
House Ghost Cup
Find all four House Ghosts.
Nature Trail Cup
Find all animal footprints.
Room Of Rewards: Discoveries
Use Wingardium Leviosa on the feather duster in the Trophy Room. Hold it over the two dusty trophies next to it, and it will clean them. Then examine each trophy. Those four Discoveries will register a 100% on the Marauder's Map.
Talking Gargoyles
To find the five Talking Gargoyles for Dean, look in the following areas.
In the courtyard where Dean is standing.
In the Paved Courtyard. You must repair the broken staircase in the corner. It is at the end of the balcony in the corner.
In the Viaduct.
The fourth floor outside in the balcony.
The spiral staircase when you walk up to DADA.
Tidying Up Hogwarts
Go to the Entrance Hall. Go in the small custodian room to the left of the large exit doors. Wingardium Leviosa the mop and hover it over each of the four odd tiles by the golden statue. It will clean them. You will get Discovery Points, and Hermione will talk, giving you a 100% on the Marauder's Map. Then, go to the Viaduct Entrance. Wingardium Leviosa the mop near the dungeon stairs and clean the odd tiles by the large staircase. You will get Discovery Points.
Using spells on objects
Any time you see any object begin to light up, cast spells until you find the correct one, then do it again on the others. If you see a student light up, then hold R1 and cast a dueling spell.
