Are there any connections or discussions in the Mojave related to HH, like when you talk to Veronica to tell her about Elijah. I know the Legion attacking you for Graham's armor would be kinda dumb, but does anyone at least comment on it?

Well I doubt anyone in the legion would know what graham was wearing, unless you could wear fire somehow...

I haven't found any interaction- haven't looked much though.

Have you played this DLC..? Because in the beginning it shows him at the dam infront of his soldiers wearing the same armor in this DLC

Really? Must have missed it.

Still, Ceasar has to live by his lie.

He can't admit that Graham lived, or the legion would probably revolt.

Too right. I wish that there were minor connections between mojave and DLC. But not necessarily changing the ending

I suspect, though haven't confirmed, that you can tell Caesar about Graham. I know that you can tell Graham that Caesar's dead, so that's a dialog connection that goes the other way.

No, there isn't. But if you have met Caeser before going into Honest Hearts, and you did not kill him, there's an option to tell Graham that you have met Caeser and suggest that you could tell Caeser where Graham is. If you do this, Graham will explain why it would be pointless, because Caeser refuses to acknowledge that Graham is alive and forbids anyone to even suggest it.

It'd be amusing to greet Caesar as Mr. Edward Sallow, just to see the look on his face.