If we were riding the ride together, I could point out exactly where they are to you and when to turn around and look up. You won't see them unless you literally turn around and look up at a very precise moment, and it is kind of an awkward position to get into while you are moving around, or if you are seated next to someone. Certain friends of mine still have not seen them because they didn't turn fast enough when I told them to, or they looked straight ahead and not up.
That said, it is difficult to describe it in words where they are. I guess the best tip I can give is that when you see Pooh stuck in the tree, with 'hunny' either dripping from his hands or on his face or both (can't recall) - at that exact moment, as soon as you see Pooh stuck in the tree with the hunny, turn immediately all the way around, look behind you and all the way up, and you will see Melvin, Buff and Max mounted on the wall, in the shadows.