They have improved this a great deal on the FireTV device where Prime content now has its own "Channel" just like HBO, Showtime, etc so you can separate what is

They have improved this a great deal on the FireTV device where Prime content now has its own "Channel" just like HBO, Showtime, etc so you can separate what is Prime and what is Amazon Instant Video on the Amazon Main website you have to click "Included with Prime" to get the prime only content