Near the beginning of the film, the recruiting officer gets squirted and the stain jumps around 3 or 4 times.
The men are all entering the submarine through a hatch. Each drops his bag down and then climbs down himself. Al and Melvin are toward the front of the line, but after they go down, not another single seaman follows them and they're all alone heading off to look for their bunks.
In the beginning of the movie, the Recruiting Officer addresses Chief Lardoski as "Petty Officer". A Chief Petty Officer is never addressed as "Petty Officer". The Recruiting Officer should have addressed him as "Chief Lardoski".