Originally Posted By: eljefino
There's an L-shaped flap inside the bead, and I've seen those damaged by mounting, and even hold air. But it all stays within the rim.
The doohickey you have sticking out looks like it was dragged out by UN-mounting, like you got a used tire, or at least one that was mounted then undone and put back on the shelf, for whatever reason.
Get a pic with your cell phone of the serial number, or at least the date code. When you complain they could take a knife, cut that tab off, and reinstall, claiming "new".
It could also be a piece of your old tire, left in place by the sloppiest employee ever.
That's exactly what I would do. Bring it back ASAP, and have them replace the tire.