As a point of comparison. The 3.5 errata totals 76 pages. The 3.5 FAQ is 116 pages long. The FAQ is mostly errata disguised as "clarifications" in that most of the answers told you things you couldn't possibly know from reading the rules in question.
This doesn't include the errata or FAQ for 3.0, which was even longer.
And I know from experience that there were a huge list of errata that never got released for 3.5 when WOTC basically gave up and created 4e instead. I know this because I was a Triad member for Living Greyhawk where all the DMs were required to use the RAW without any changes or house rules. Because of this I got many, many e-mails sent to me asking me rules questions. Most of which I couldn't answer because no matter how many times *I* read the the rules, FAQ, and errata, I couldn't find a clear answer anywhere.
Near the end of 3.5e, the Circle(who were in charge of Living Greyhawk and our "bosses") asked us on behalf of WOTC if we had any outstanding rules issues that repeatedly came up so they could issue a large amount of errata(apparently, because they wanted to "finish" 3.5e before 4e came out, but we didn't know that at the time, we just figured they were finally trying to fix the game enough that we could stop dealing with all the rules questions in the future). We came up with a very large list of questions and complaints we had received. Most of which were never errataed or fixed before WOTC decided to stop doing errata for 3.5e.