There is an issue when casting and wanting to fine-control media. When you first cast an item you have a lot of controls available and can skip ahead or jump back 30/10 or whatever your setting is. Once you view the queue or leave the app and re-open you don't have this option anymore and cannot get it back without stopping the item playing on your device and beginning cast again.
Two screenshots show one set of controls then the more useless set of controls when in casting. The horizontal one are the controls you get to keep right when you cast. The vertical are the less useful controls.
Ideally you'd get the same set of controls you have when you are locally playing in cast mode whether leaving or rejoining the app.
Also a fun bug when you swipe out of the app once you are casting at first it can accidentally turn up the tv volume to 100.