When Meg is trying to erase the "48" on her locker, the traces of the deleted "8" change between shots.
In the Pilot episode, Pilot (2004), the news report shows an evidence bag with Lilly's (Amanda Seyfried) shoes, which are sandals. In this episode however, they are shown to be sneakers.
Abel Koontz (Christian Clemenson) loses his accent after telling Veronica (Kristen Bell) he knows who she is.
The email addresses should end with ".edu" rather than the ".org" used. It should have been something like "veronica.mars@neptune-high.edu". The ".edu" ending is the top-level domain for educational institutions.