Corrected entry: In the beginning of the film, you see one character has plants of weed around. Marijuana can grow roots up to six feet, and he does not have enough dirt to grow the plants.
Corrected entry: In the scene where Methodman and Redman meet they are sitting in the car and smoking. From outside you can see large amounts of smoke in the car, but in the next shot there is no smoke in the car at all.
Correction: It may appear to be all smoked up from the outside, but inside the car it won't be as smoked up as it appears.
Corrected entry: At the end of the film when the teacher cut his shirt and he start to talk he doesn't have his gold teeth anymore.
Correction: His teeth were silver, but either way, there are teeth covers that are not permanent and can be removed, which you should do when eating, and this was a dinner party.
Correction: The weed plant can grow just about anywhere given certain conditions. Often times (more valid for indicas) the size of the plant will depend on the size of the pot. As roots network to their full extent the plant slows its vegetation rate.