[ClearCase_guy]

The key thing is that an actual noose is a slipknot -- it tightens when pulled.
If you want a garage door pull rope, you want a knot that doesn't slip.

I imagine that NASCAR folks also might do a fair amount of fishing. They might know the Kreh loop knot.

A photograph probably won't help to distinguish which is which. Without the actual object, there is no evidence at all that anything happened.

[A Navy Vet]

The ones I’ve seen in photos look like common bowline knots, that don’t self tighten when pulling on the loop.

[Lee'sGhost]

Correct. On an actual noose, the tag end would come out of the top of the knot.