I do things like this all the time and never have an issue. Granted, I've never done this with Google Glass as I haven't gotten one. But your scenario is carried out every day across the country without issue.
Oh, and please, share the federal law that prohibits carrying a camera into a theater? Oh wait, we covered that already. It doesn't exist. And, unlike some dystopian future you might imagine we live in, being able to commit a crime doesn't mean we've actually committed one.