When the stolen vehicle containing the two criminals and two kids flees the lot, you can see all four occupants inside. However, the wide shot of the vehicle on the entrance ramp to the freeway only shows one occupant (driver) in the vehicle.
The roof mounted antenna appears and disappears on the stolen vehicle.
According to the characters' dialog throughout the episode, the freeway chase moves (in order) from the 101 southbound to the 10 westbound to the 405 northbound. This makes sense geographically, but none of the scenes that supposedly take place on the 10 westbound are actually filmed there. The Santa Monica Freeway passes over mostly flat ground, and it is a raised freeway for most of the way. All of the freeway scenes take place on a lowered freeway next to foothills (filming most likely occurred on the 118, the 134, and/or the 210).
When the boys enter the vehicle before its stolen, the camera crew is reflected in the rear window.