I think it's possible, but even I haven't managed it, yet..
You have to wait until the object that holds the Crests glows the brightest.. at that point the most Crests will be deposited =]
You have a chance to go back and become Duelling champion, play games of Quidditch, collect all of the crests and master all of the potions.
You fight a few Death Eaters and then the game's storyline is over. You can continue to play in order to collect the rest of the crests and so forth.
Use Wingardium Leviosa and chuck objects at 'em to get them.
When you have finished playing the tune that the dragon roars at you, he falls asleep with comical yellow 'z's' coming out of his mouth. When he falls asleep keep tapping the yellow key and you will get it.
YES ! when you make it you can use it on anyone including yourself. The only thing the love potion does is makes you walk slowly, and instead of mini-crests, you collect mini-hearts (which count as crest).
They are all over the castle and grounds. Sometimes you have to unlock certain spells to unlock the crests if they are blocked by an enchantment. They are sometimes even sitting in corners or out in the open. Just carry on through the game and you're bound to find some. Many are hiding behind cobwebs or above doorways, the former in which you must use incendio, the latter you must wingardium leviosa an object and throw it at it, and so on. Mini crests make up crests as well.
Draw posters with Hogwarts, Gryffindor, Hufflepuff, Ravenclaw, and Slytherin crests and hang them in the hallways.
Collect 10 knight's crests then bring them to Orca on outset island to learn a new sword trick.
You can find German family crests at familycrest.com, or at houseofnames.com
yes because all waves have crests and troughs.
no