She Gave Out Hugs
In the past, it was forbidden to touch someone in the royal family. Diana broke that boundary because she didn't want to perpetuate the idea that was any sort of divide between herself and the public. Not only did she stop to chat and shake hands, but she'd also hug anyone who wanted to interact with her.
She Chose Her Sons' Names
In the past, the father took on the responsibility of naming his royal children. Furthermore, the names were typically already within the family and held some sort of historical significance. However, Prince Charles did not name William or Harry, Diana did. He wanted to call them Arthur and Albert, two very important royal names, but her preferences made the final cut.