As recommended in Reducing File Size, I'm looking at the "Player size statistics" section of Editor.log to see what's being included in my .unity3d file. There are a few assets listed that I don't want included (some textures from the Standard Assets folder, for example). I assume I must be referencing them somewhere, but I've looked and can't determine where.
Is there an easy way to tell why an asset is being included, in order to track down the source and eliminate it (or leave it as is, if it turns out it really is needed)?