No, you don't.
I believe that once you see a flyer in your hand, in your mailbox, under the door, etc, the general reaction is to at least flip it over and see if there's anything else on the back.
Also, the way you layout the elements on the front can induce the idea that the content extends on the back.
For instance, if its a product being sold, the lack of contacts or product specs from the front will automatically make people think this information must be on the back.
Big picture and logo on the front? Everything else must be on the back.
So I believe the flip over arrow can definitely be a clear indication, but slightly unusual, as most people will probably flip it over anyway.
[![enter image description here][1]][1] [1]: https://i.sstatic.net/VerlS.jpg