The shoe thing, I figured it was from another kid.
So big middle finger to the audience, then.
You don't show a close-up of a kid's shoe, then in the very next scene show the exact same shoe close up on a living kid. That's just dishonest.
I'd have to rewatch to be sure, but maybe their timelines haven't synced up yet. If I remember, we left the psycho kid just a bit up the tracks from the zombie bitten, but not yet converted, stranger. They were staring at the sign for Terminus.
There's still the possibility of the kid going back down tracks and getting eaten by the bitten stranger, or the bitten stranger coming up track and then carrying her shoe back down before Beth and Daryl arrive on the scene.