...ried, great, I think it's just a bit of a mix-up that the tombstone was there, because the date of death on the Richard Grayson one is August 23 2000. If this tombstone was there the day Bruce's parents were buried it means Bruce is under 23. (He was 8 when his parents were murdered, it's 2015 now, you do the math.) Something which he clearly isn't in this movie. So I think they just got their hands on a graveyard which they could use for the movie, and decided to use it for all scenes with graves in them. Hoping it would lead to all kinds of wild speculations about what's going on, which it did.