Good movie RUINED with a single scene!!!!

Rating: 7/10 (27 January 2005)

May be considered a spoiler!
Okay, a very good movie. Why the whole prison scene? Until then he was a "time shaper" of sorts. When he wakes up with no arms, his buddies only knew him with no arms, right? So, how come he goes back to his school and slams his hands into the spiked memo holders and goes back to prison (through time) and his cell mate all of the sudden believes he saw the scars on his palms appear?! How could he have known him WITHOUT the scars?
The title itself has to do with, "time being so delicate a butterfly's wing flap can change it", or something, follow? So how could something so dramatic like slamming his palms into the spikes not only, land him back in the same jail cell with NOTHING different?
I don't believe I am nit-picking here. It is not a blooper or a faux pas. It is a complete change of story!
A good movie with a well thought out story is hard to find. To bad the powers that be RUINED an otherwise great movie!!