Much of the action takes place at Lincoln High School, but the logo on the basketball court (seen at graduation) is a large "M".
When the car "explodes" you can see no flames coming out.
In the final fight scene between Louis and Silverio, Louis' students are clapping and starting up the "Paranaue" chant when he is almost defeated. In several shots after it starts, the students are seen in the background among the fight circle, not clapping or chanting at all, yet it can still be heard.
After Louis damages the car shop, he is chased throughout the neighborhood by the Brazilians and the Jamaicans. He is eventually cornered on someone's property and hiding in the midst of hang-drying laundry. One thug closing in on Louis, can be seen flipping a switchblade and saying something in Poturguese. When the camera shows his face, it's clear that the actor's mouth is not moving even those words are still being spoken.
In the first lesson, the Capoeira music starts while you can still hear Kerrigan putting the tape in the ghetto blaster.
In the chop shop scene, when Louis and one of the bad guys are fighting with metal poles, the poles strike each other and then the sound follows a split second behind.
During the fight in the chop-shop the sound FX that accompany Louis's actions with the long pipe (spinning and striking) are delayed by approx 1/2-3/4 of a second.
About mid-way through the film, during a training sequence between Louis and Shay as Mr. Carrigan walks into the firehouse, someone off camera shouts out, "Hey Mark!"
Donovan says he ran Louis' cassette tape through a midi setup. A cassette tape is an isolated prerecorded audio track which cannot be modified through a midi setup, not the way Donovan is describing.
Throughout the movie, Louis Stevens performs the capoeira "ginga" incorrectly: he keeps his arms low, never bringing them up fully to protect his face.