=Spoiler alert=
1st. Aela the Infinite Werewolf. This happened because I beat the crap out of Aela just before drinking from the basin, so as she was stunned I drank the blood and in the end she appeared outside the silverhand hideout as a werewolf. She was still able to speak to me and all, and I passed all of the quests up to the point where Kodlak was to be cremated. Except now she cannot do the animation of burning kodlak and the questline for the Companions is broken. So much for coolness huh.
2nd. Report back to a decapitated Fjola. Now this one is funny. I got to Fjola, got her ring through dialouge, attacked her with the dialouge for fighting her, killed her, reported back to the old man, he attacks me, I lower my weapon, he stops, I talk to him again and am able to give him the ring, and now I have to report back to a decapitated Fjola. Long story short, I broke this quest too.
In the end there is too much for me to think about and write at the same time, so if any of this stuff or anything like this happened to you, feel free to post it here.