This is an excellent episode with some great scenes.
A flub occurs when we see Higgins and Luther dressed in black at the dock looking for Warren. The camera is behind a dumpster focusing on Higgins and Luther as they are walking. As they get closer the inside of the dumpster comes into view, and as Luther is singing "Anchors away my boy" you will see Warren in the left-front corner of the dumpster moving his left hand and breathing.
This is a flub because Warren is supposed to be dead.
Not necessarily a flub but when we first see Luther going to his office he uses his key to unlock the door. Why was this necessary because Higgins was already inside waiting for him? How did Higgins get into the office? At the end of the episode, Magnum and Higgins had to break into the office using Magnum's credit card.