I'll agree about Harvey. Then again the original plan was for Harvey to become Two-Face at the end of the second movie and then the third would focus fully on Two-Face. Things changed during production I believe. JA can correct me on this.
If I remember during the writing process Nolan decided against that idea, I guess he wasn't sure about doing a 3rd movie at the time and wanted it all resloved. There was talk about a planned Joker cameo in 3rd movie until Heaths death I believe.