Well Oreo answered most questions pretty well so i’ll add just a few things.
I have to pass on the ‘how many Wizards’ question. Roughly 1000, divided by the number of houses (4) gives us roughly 250 kids per house. 250 divided by the number of different years or grades(7), leaves roughly 36 (rounded up) kids per year in each house. If that is the case, Harry certainly isn’t noticing everyone around him. Also, there is only one Gryffindor dorm. 250 kids in the one dorm, how does Harry avoid these people?
As regards the Portkey - Crouch Jr. was disguised as Moody, Moody seemed trusted by Dumbledore - so therefore he probably had some kind of access to the TriWizard Tournament cup - I doubt he would have been able to come up with a reasonable excuse that would give him equal access to Potter’s toothbrush, or other personal items that he would be likely to touch.
As for Quidditch matches lasting for days, ever heard of Test Cricket? A test match is 5 days long.
I don’t think Quidditch is in any way more or less silly than any ‘real’ sports that humans have invented. When you examine most sports there are always a few rules or concepts that stand out as slightly stupid or meaningless - but that’s because, like Quidditch, they’re games. They’re for fun - not for close examination and analysis.
ITR Champion - No offense intended, but I believe Rowling has stated several times that she had pretty much the whole plot and the world the plot happens in worked out before she even put pen to paper. Good question about Dumbledore and the Portkey though, I’d like someone to explain that.
BTW, what does the ITR stand for?
One thing that bugs me - and I wish I could remember which book this is in - is that there’s a narrative line (I quote roughly):
“…Harry quickly picked up the Invisibilty Cloak and shoved it in his pocket…”
What? That thing is huge. I think if Harry had a pocket big enough to fit that in, it would have been something worth alerting the reader of.
I’ll try and find a page reference for you. And a more accurate quote.