In this episode, Henry refers to an "alienist". This is a somewhat archaic and little-used term for what is today called a "psychiatrist".
The painting of the ship hanging in Rick's office is the same as the one in the back of the vault from "Hitler on the Half-Shell".
Cuba Gooding Jr. who plays the role of the wealthy entrepreneur sponsoring the salvage team's dive, coincidentally stars in Men of Honor (2000) as Carl Brashear, the first African American Navy diver.