This section covers any new errata discovered that old errata by Wizards of the Coast missed. Usually, a note will only be added here if explaining it in actual text would be clumsy. In such cases, the correction will link to a longer explanation here. Such corrections do not have to be taken as canon, but each should be given serious consideration.
When you find a disagreement between two D&D rules sources, unless an official errata file says otherwise, the primary source is correct. One example of a primary/secondary source is text taking precedence over a table entry. An individual spell description takes precedence when the short description in the beginning of the spells chapter disagrees.
Another example of primary vs. secondary sources involves book and topic precedence. The Player’s Handbook, for example, gives all the rules for playing the game, for PC races, and the base class descriptions. If you find something on one of those topics from the Dungeon Master’s Guide or the Monster Manual that disagrees with the Player’s Handbook, you should assume the Player’s Handbook is the primary source. The Dungeon Master’s Guide is the primary source for topics such as magic item descriptions, special material construction rules, and so on. The Monster Manual is the primary source for monster descriptions, templates, and supernatural, extraordinary, and spell-like abilities.
Source: Dungeon Master’s Guide (version 3.5) errata list.