If that's an example, it might be a good idea to improve on standard-compliance first, or at least change doctype to match better with the HTML variant you're using.
Apart from that it comes through reasonably ok.
Yeah, those embedded YouTube videos on this page have some code that doesn't validate. YouTube pages themselves don't even validate. Fixing old Macromedia markup isn't high on my list of priorities at the moment, and it's not much of an issue on a small site like this one.