Coach, if I'm working your 14u travel game a quick word as I'm standing next to you during the game will go a long way. Something like "Lot of movement on those screens" said in an offhand manner. Who knows, I may give you one!
(Most likely you'll get a quick "OK I'll look coach".)
But if you come to me before your 14U travel game and ask me how I'm going to call screens you can be pretty sure I'll find one against you in the first couple of minutes.