When Johnny's in the bar and the Dodger fans say they want to watch the game as it's the bottom of the 9th, they cheer when the Giants hit a walk off HR. It can't be a walk off HR because the Giants are wearing gray away unis and the Dodgers are in home whites.
Louis Larusso says the trade-in lot is missing a 1993 Dodge Caravan but it's a 2001 model.
Stingray is mentioned thlo have been put on probation after the events of the high school fight and must remain a considerable distance from all students, when in real life he would most likely be thrown in prison for blatantly attacking minors (especially notable since the only thing that kept Tory out of juvie for cutting Sam with a spiked bracelet was being her ill mother's caretaker).
Daniel tells Louie to find him the VIN Number of the stolen van. VIN stands for Vehicle Identification Number, so Vehicle Identification Number Number is redundant. He should have just said "find me the VIN of the stolen van."
During the fight at the school, Tory slices Samantha's right arm. But when Samantha removes the band-aid, the scars are clearly on her left arm. Later in the episode, the scars appear on her right arm again. However, the first shot in question was her looking in her mirror, so when she removed the bandage from her right arm, the reflection makes it look like her left arm.
California state law would require that nearly every student involved in the fight seen at the end of Season 2 would be expelled, especially those involved in bringing weapons into the school and assaulting teachers. With the exception of Tory and Miguel, all of the students from the fight are back in school seemingly with no consequences or repercussions.