Not sure if MLB uses the NFL criteria of reversing replay calls(It has to be irrefutable evidence or something along those lines) but by that standard alone it should be a HR .I saw this play in a variety of angles & the following seem to occur:
1)Guy in what I think was a green hat (left of the screen I believe) seem to reach over interfering w/ the play-Fan Interference
2)The RF(Crowe?) went over the wall, ball bounced off a fan(not green hat guy),other fan in green hat tried to grab the bounce,he botched it & ball went onto the field-Homerun.
3) The ball seemed to hit the top of the wall( I thought this) ricocheted in the stands both butcherboys couldn't come up with it & ball went to the field-Groundrule Double.
Again, this was how I saw things others may have seen the same,others may have seen other scenarios. You'd think after the Jeffrey Maier Baltimore playoff series the new stadium would have been designed to avoid this situation but I guess not.