First of all...you mean for once I caught something the first time that someone else didn't?! (I'm still noticing details others saw the first time, but this was one thing I did notice!)
It's NOT a sound effects mistake, for sure. The ring also doesn't roll or spin - it just lands, hard. Very cool, and definitely symbolic.
Oh I miss a lot of things the first (and 21st...???) time around. Donner says it's true to the book. Makes sense to me. But it didn't stand out to me until last night.
"the ring...it's getting heavier..."