This is a very old joke, and refers to a worthless piece of equipment.
"Screen Door" on a submarine refers to the in port hatch Security Screens, used to keep equipment, people, debris, bugs, etc. from entering the boat by accident (or to slow down a potential threat) while moored in port. If they were in place and the hatch still open, the boat would of course flood. Therefore, the term is a reference for any useless piece of gear.
it referred to sinking ships
The phrase these creatures line 2 refer to 'strongly right hand'.
m
This phrase means literally: From many, one and is used to refer to the many states forming one country in the USA.
refer to the above subject
the director
This phrase means literally: From many, one and is used to refer to the many states forming one country in the USA.
One out of many
Gatsby continuously uses the phrase "Old Sport" to refer to the people he is talking to.
Sub has several possible applications, including a submarine, substitute, subscription or it may refer to lower positioning.
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Where you reside.