Little, and not with effect on the trilogy, just affecting their scenes
Isn't that what was asked though? To re-do scenes?
Changing up dreadful dancing scenes is a big issue; not something like changing the way Otto should be acting when he woke up from the massacre of his tentacles. One is a little action while the other takes up an entire scene.
Goofball arrogant dorky Peter, not emo Peter
Yah...nothing emo about this. That's emo; no way is that an arrogant dork...besides, those two words cannot go hand in hand. Whatever Raimi was trying to accomplish failed because "arrogant" and "dork" will never go hand in hand.
They are short, minor, and easier to ignore than what you defend

Taking away how the symbiote should be acting to its host is not easy to ignore.
The entire franchise revolves around a dork, you can't expect him to be as evil as the Web of Shadows version (TREMENDOUSLY wrong version BTW)
You think Web of Shadows' version was evil? HAH! Black-suited Spidey was still as dumb as the game itself; breaking Wolverine in half wasn't even an "evil" move as it made the game even more dumb.
The franchise revolved around a "dork", but that doesn't justify the reasoning that the symbiote couldn't have made him more dark, as it would've been a perfect polar opposite to who Peter truly is and that's what the symbiote is about. Peter in TAS and TSSM were polar opposites when in contact with the symbiote.
No, it was shorter than his last fight with Sandman, and with his first
The first Sandman fight was about 1:40, the second fight was about 3-ish minutes.
The jazz scene was 1:20-ish and the montage was 1:30-ish.
Still damn close enough.
Ignothing, it's in its proper place, same universe has the same rules apply to it, and losing his powers in SM2 doesn't prevent losing his powers in SM3
He was better at his job and he was with the woman he loved. If anything, he would've only lost his powers when Mary Jane broke up with him, although he was still filled with rage to overcome that and that was towards Harry. No where was there time for him to "sulk", as you call it, for him to over think things and lose his powers.
What? Haha. He was "lovesick" and stressful. That wasn't anger.
Which is a very stupid cause for him to lose his powers, hence, stupid movie
It worked for the movie. I am not fully into the idea of him losing his powers because of what happened in his life, but it is what it is, much like Otto being sympathetic in the end. Things work solely for the movie itself, which was NOT stupid for what it was worth.