there are a couple of tracks that can't be matched, how do i identify them?

Hey Atetzt,

Thanks for the question. The following icon is what you’ll want to look for in your iTunes Library:

This icon appears next to items that aren't eligible to be uploaded to iCloud using iTunes Match. For example, songs that are larger than 200MB or songs encoded at 96 Kbps or less.

iTunes Match: Understanding the iCloud Status icons

http://support.apple.com/kb/TS4124

If you do not see these icons, you can enable them via View > Show View Options > iCloud Status & iCloud Download

Thanks,

Matt M.