IIRC, groups go through several stages:
Seems like this crew never got past the Storming stage.
Here are some more details on each step:
IMHO, a good skipper watches to see what stage the crew is at, even if it's just subconsciously. You can then work through the issues that are holding your team back.
There are more specifics (and written very well) here: http://joeypauley.com/leading-high-performing-teams
In the very limited eperience I've had looking for crew, I did phone interviews looking for something specific. Then we talked on the boat prior to departure, learning about each other, and covering safety scenarios. Of course this was for a 2-day coastal cruise, a much shorter trip.
(MS Applied Behavioral Science from Johns Hopkins -- was going for an MBA originally, but found this type of training personally interesting, so I started loading up on these types of courses.)
By the way, my personal favorite sayings for this are: "criticize behaviors not the person", and "politeness goes a long way". To me, those two guidelines help keep the stages progressing.