What problem does the group face as they arrive at the dock?

When they reach the docks, McMurphy argues with the captain who was supposed to take them out. He demands a signed waiver clearing him with the proper authorities. While McMurphy argues with the captain, a couple of men at the dock yell disparaging comments at Candy, asking whether she is one of the insane or part of the cure for them. McMurphy exits the captain's office and tells the men to quickly get in the boat. They all jump in and push off before the captain gets off the phone.