The dark haired girl in the gray/black outfit standing on the sidewalk talking can be seen walking past them twice in the same direction, after the gang leaves the Bar Association guy's office. She passes behind Charlie & Frank.
Frank took a briefcase to the meeting with the Bar Association representative, assumed to be filled with cash, yet after the meeting while walking on the street the briefcase is nowhere to be seen.
When Frank opens the suitcase and gets hit with the ink, Charlie can be heard laughing even when it shows his face and he's sitting still.