Chromecast Is Sort-Of Android Based
This article is really awesome http://blog.gtvhacker.com/2013/chromecast-exploiting-the-newest-device-by-google/
it states that the Chromecast is actually stole some bits from Android. I even got a request (and this link) from @zhuowei for a teardown.
So I looked. But, as it turns out, it's only the low level stuff from Android. That's not really my department. There's no APKs to tear down, or really anything for me to look at.
Here's my interpretation of the article.