I also have a 65uh8500 and I can say that I can't remember any notable crosstalk on Mr Peabody/Sherman but I can say that when I bought this Tv new at best buy, I had to go through two different sets because my first one had crosstalk on the top portion or bottom portion depending on the angle. I played around with angles , 3d settings , what have you, but unless I was in some absolutely perfect position right in the middle of the screen , There was really bad crosstalk.
I've read so many articles and posts on this but I can speak from experience that with the second set I got , you have a good three feet of vertical "wiggle room" from eye level before you see the top/bottom ghosting. I just got myself a used 65ef9500 because it was a steal but sadly, it has the EXACT same issues as the first 65ub8500 I returned.
I haven't been able to find one good LG tech or article that has been able to explain what causes this. Pretty much most people returned the entire set, got a new one, and problem solved. But those of us who have tvs now or get used ones, what do we do? I actually came to this forum in hopes to find someone who had this and isolated the issue.
I've had three panels installed from LG through their extended warranty on my 65uh8500 within the last two months (good news for you, they have the parts!)because of a banding issue and not one of them have had the ghosting issues that first tv had so I'm starting to believe it's the main board.
Perhaps some capacitors burned out or the soldiering wears out over time or maybe there was a power spike that fries the portion of the board which controls the 3d?? Is that possible?? Or does any issue with the crosstalk have to be panel related?? Can anyone here help who's had success with replacing components ??