I think it's particularly telling that the grounds crew at the new Target field decided on their own to take a photograph of Killebrew from the 1960s, showing him winding up to take a swing at a ball, encased it in plastic, and slipped it under home plate, where it will remain for the rest of the season. They didn't tell management or anyone with the Twins organization, and when they found out after the fact, they respected the decision of the grounds crew, because Killebrew always went out of his way to know everyone at the ballpark, including the grounds crew.
They've also emblazoned an outfield fence with his signature, because he actually practiced his signature so his autograph would be absolutely clear (and it is a lovely signature). Several younger players, including current players, have stepped forward and said that Killebrew was constantly on them about improving their signatures, because he felt that if people stood in line to get your autograph, then it should be clear enough for them to read easily. He did it kindly, as he did everything, but he made an impression. Michael Cuddyer said the only reason he now has a legible signature is Harmon Killebrew (who also dated every signature, which I appreciated).