Donna getting Louis to panick and run away from trying to get his reward from Harvey for doing Harvey a favor.
Donna: (fake crying)
Louis: Oh shit... (runs away)
Also, Harvey's realization that Donna used the same trick on him before to get him to let her parents stay in his condo.
A Call Back moment occurs when Donna begins crying in front of Mike as evidence of her excellent acting skills. Mike, of course, panicked too.
Harvey telling Mike he's getting really good at ... ruining the moment.
Mike commenting that he was a fabulous criminal, only for Harvey to remind him about how his briefcase fell open and then there was weed all over the floor
Every time Mike gives Harvey an idea, only for him to reject it. A few scenes later, Harvey inevitably does the exact same thing Mike told him to do, insisting that he did not say it was a bad idea.