If Dent were to return for the third batman film...

Would all he had done be un-done since I'm guessing he wouldn't be back invite batman for Tea and crumpets? This isn't a thread saying he is coming back this is a thread saying IF he came back just to make things 100% clear

If you mean all those criminals he arrested getting released, then yeah. I suppose so. But Batman took the blame at the end for everyone that was killed, so eh..