Oh, there's the time line issue regarding the chuunin exams too. In chapter five the exam is in "two months" which seems a bit crunched with everything that comes in Teamwork 2.

And Sasuke's attitude toward Iruka seems a bit... well strong is too harsh, but it he seems to have something more than just "this ninja is below my level and not worthy of attention" going on. I wouldn't say dislike precisely, but definitely more disdain that I would expect of Sasuke toward someone that is basically irrelevant to him. About all I could come up with for a reason was very subconscious jealousy over Iruka and Naruto's relationship, that and being in pain and generally grumpy.