Oh Shaco, everyone attempting to share your secrets in a vain attempt to stop you from carving their teammates into little pieces.
"Say you ain't scared, but you know the truth, I do more damage from behind than John Wilkes Booth, I'll slice your skin off and wear it like a 3-piece suit, deceive your teammates, hop walls, avoid pursuit"
On a slightly more serious note, the clone will always face due North when it spawns initially, if you're observant enough you will always know which one it is. On another note, I want them to change Shaco's ult, and I have a terrifying great idea for it too. So they make it still have the "Pardon me for a moment while I stop existing" thing, but when that ends it spawns in a handfull of puppets that either deal no damage or a small fraction of Shaco's damage, and then the "perfect" replica of Shaco himself. Alternatively if that isn't nightmare inducing enough they could just make it like Phantom Lancer from DotA 2, you pick a ground target and then rapidly shift (while untargetable) to the location and spawn the clone on arrival.