As Giles and Buffy practice "Reading and Comprehension" for Buffy's upcoming SAT tests, there is an insert (close-up) shot of Buffy's test booklet that (1) shows the "Analogies" practice test instead of the "Reading and Comprehension" test seen in the rest of the sequence; and (2) is pristine, with no answer bubbles filled in, while the R&C page seen in the rest of the sequence has several answers marked.
Joyce says that she's letting Buffy pay for the damage to the car on the installment plan. The accident was not Buffy's fault and the other driver would have to pay for all the damage. However, they can only make him pay if they can find him. Instead, they let him run away without checking his ID or getting any kind of information on him.
When Mr. Trick escapes the sewer by ladder and pauses to taunt Buffy, what's supposed to be a starry night sky behind and above him is clearly some black material with an array of lights in it, which are far too bright and uniform to be stars.
Just before Buffy's auto accident, the camera cranes down from an overhead traffic light to show her car approaching the intersection that the light controls. However, painted on the street below are the standard "Stop" markings for an intersection controlled by stop signs. Obviously, the traffic light is a prop and does not belong there.
At 30:50, Xander hands Willow a book titled "Demon Dimensions", misspelled as "Dimentions".
At 23:50, as Buffy drives towards the camera, to the right of her car in the background you can plainly see a mobile lighting tower, parked at an angle to the curb with its mast extended up out of frame. It supplies all the illumination for the scene, backlighting the trees Buffy is passing and casting a dense shadow underneath her car. It can be seen again when Buffy has her auto accident, parked at the curb in the distance.