Catch me if you can

Bugs, bugs every where

Here are some clues to find the bugs in the codebase

1. There are several PHP warnings in the Drupal error log.
2. Cannot access About page.
3. Cannot execute update.php

db/d7-debug.sql is the dump of the db to be used.

You have to find all the bugs based on the clues given. Email the list of bugs along with your explanation to [email protected]