After getting the speedy-spellcasting section from the Guide to Dark Forces book, your spells are casted faster, but when you turn the game off and then when you turn it on again, the spells are casted at normal speed. To get them back speedy, you have to kill all of your players. The fastest way to do this is go to the Hogwarts Grounds and drown in the lake or other water source. After that, your spells wil be speedy again.

To find Lady Carmilla Sanguina of the Vampires Card Set, let Hermione use Glacius on the fire in the Gryffindor Common Room.

When fighting the fire armor thing when you just got Glacius, to avoid the shooting fire rocks when he opens up, stay directly in the middle. You should be able to avoid almost all of them.

Start with Flipendo until he opens his mouth, then use Glacius until he sort of explodes (this does not mean that he is defeated). One of his arms will come off. Use Glacius to put out the fire, then use Flipendo to destroy it. Repeat until he is defeated.

When you talk to other pupils look at their tie and you will notice that every one has a gryffindor tie on.

The only people with a different tie on are malfoy, crabbe and goyle (sorry about the spelling) and only two people have their shirts out (ron and seamus) and either crabbe or goyle (cant tell which) has not got a school jumper on. And you can change the colour of the hippogriff - after you save buckbeak - by going on hippogriff flight on the extras bit on the main menu.