I see lot of question being asked on Lightning Out and every time users post such questions, many don't add the information that Lightning Component is run inside a VF container only few does it, and most of such question's first comment from the users who are trying to answer the question is:
Are you running the component inside VF page?
I think it's time to introduce the new tag, so users can tag it if such question arises by editing/posting the questions.