Veronica's (Kristen Bell) Le Baron plates are 6BLA504.
Do you have any idea what your little joke cost me?
Veronica: Well, I'm pretty sure you won't be getting your bong back.
Logan: Wrong answer. Would you care to guess again?
Veronica: Clearly your sense of humor...
Throughout out the series, it's clear that the actors/actresses portraying teenagers are actually in their 20s+. This is done as to not interfere with the schooling of real teenagers and to give the general viewing audience who are teenagers themselves someone they can look up to.
The first season finale did not include the usual opening credit sequence. The credits simply appeared over an early scene.