- Madolyn and Costigan's relationship is genuinely sweet despite the circumstances. You can tell that if things were different, and Costigan was not in his situation that he would have liked to have been with her, and Madolyn for her part greatly misses Billy at the end, while, presumably pregnant with his child.
- He's an unrepentant asshole, but Dignam's devotion to the police force and the Captain is quite heartwarming.
- At one point he drops his abrasive act and tells Costigan without any malice and in complete sincerity that he's too smart to be a cop and would be better suited doing something else.
Heartwarming / The Departed