Continuity mistake: The position of Lisa, the blood, and the windshield cracks change between the suicide scene and the scene of Rachel discovering her dead body.
Plot hole: After the scene of Rachel as a child, there are six days worth of events in what should be five days. Monday Lisa kills herself. Rachel works at photo hut. Tuesday Jesse and Tracy have sex, Walter is hit by car. Wednesday Rachel stands Jesse up because Mark and Eric have come to her house. Thursday Jesse and Rachel's first date - no sex. Thursday again Eric meets with the DA and Jesse and Rachel have sex. Friday is the game and party.
Continuity mistake: After the season opener football game, Rachel is seen in the back seat of a convertible with two other girls in the front, heading to a local party. In that scene the sun is shining. In the the next scene, as the girls arrive at the party, it is dark outside.