alot of mistakes

the movie has alot of inaccurasies... for every life they take one comes back... so why the hell does lawson sit there with having kate killed the night before, vinne should of been there next to lawson then instead jimmy has a vision and they find her body that night and the next day vinnie takes her place.... he should of the previous day, where we see lawson laughing at jimmy and looks towards kates desk. vinnie should of shown up then..... and also they introduce north in the bathroom 'he decided to come up when chip cashed in' but north came up before, hes in the car when they rip chip to pieces also, when there chasing billy on his bike all 3 of them are there. technically none of them at that point should of been there. they introduce lawson the next day when the principal gives jimmy lawsons transfer info. so jimmy saw lawsons car kill billy but none of that should of happened. but i suppose how else were they gonna introduce us to lawson coming back. he took billys seat in class when they killed billy...... Also when you see the car drive away off the bridge u do see 3 people in the car.....in the 'goofs' section they say you just see lawson and vinnies profile, but if u look close north is sitting behind lawson as he laughs and drives off the bridge...they have it that its 2 but if you look, theres 3 of them. how do movie people dont notice these errors? they are the plots of the movie....