It was obvious the fan(s) hit the glove and forced it closed.
The only real debate is whether the fans interference occurred over the plane in play (field side) or not (stands side).
If a fan hits the glove on the stands side, the rule is clear: it is NOT interference.
If the fan interferes on the field side, then it is interference.
I do not think there is any clear angle that shows where the touching of the glove occured, but there are several hints that show, to me, it happened on the field side of the plane.
1) Look at the fans. They are up against the fence and leaning forward slightly.
2) Their arm are in front of them and/or slightly to the side, but they are clearly outstretched. One fan looks like his arms might be parallel to the wall and not reach over (the guy to the right). By looking at a 2 dimensional photo, you can still determine depth.
3) Look at where Betts left the ground and landed. He hit the wall almost at the same time his feet hit the ground, so he started his jump away from the wall and ended up at it after his glove had already come down after the play.
I do not think his glove went over the plane. It may have a little after contact with the fans, but not by much.
I think the fans broke the plane.
Interference was the right call.
Didn't the review agree with the call and not say it was "inconclusive" thereby withholding the call on the field?