Also working from memory, I recall a game in the middle-late part of the year where it was a late-afternoon start (probably 3:00) where the shadows start to come over the field in some tough ways, and over and over hitters from both teams were walking back to the dugout, shaking their heads, muttering to themselves, and often saying things to the on-deck guys and people in the dugout. After that game there was a lot of talk about the glare from the Minny and Paul sign as well as the shadows and movement of the trees where it was very hard to pick up the ball. And yes, it was to the level of "that's not safe." And it was both sides. Right after that is when I remember the discussion of the backdrop kicked into high gear. Again...that's my memory of it, so it's always possible there's some slippage there!