The Warner Archive March 26, 2019 Blu-ray release of the 1966 Doris Day romcom "The Glass Bottom Boat" offers a threefer in terms of combining a typical Doris Day comedy, a beach movie of the era, and an equally era-apt Cold War comedy.
The following YouTube clip of Day and co-star Arthur Godfrey singing the catchy theme from "Boat" provides a good sense of the fun of the film.
Day plays premature widow Jennifer Nelson, who is an entry-level public-relations worker at an aerospace research lab that roguish Elon Musk of the '60s Bruce Templeton (Rod Taylor) owns and operates. The film title refers to the tourist vessel that the father (Godfrey) of Nelson owns and operates on Catalina Island. An element of "com" enters in the form of Nelson supporting the family business by swimming below the boat while dressed as a mermaid.
Nelson and Templeton meeting under embarrassing circumstances while engaged in their typical weekend activities introduces the "rom" element. Later meeting at their day jobs enhances this element. More '60slicious fun come in the form of Dick Martin of "Laugh-In" fame portraying the playboy business partner of Templeton.
The Cold War aspect relates to the degree to which Nelson and Templeton develop their "rom" coinciding with the increased espionage activity related to a government contract. This provides the context for Paul Lynde to play a comically overzealous security officer who ultimately finds his job to be a drag.
The real fun begins when Nelson gets wind of Mr. Right and his colleagues suspecting her of treason. This girl subsequently seeking to turn the tables on her bosses finds her embroiled in genuine life-threatening intrigue.
The beach movie vibe relates to the catchy theme that Day sings, Templeton almost literally learning about the quantity of fish in the sea, and a couple of scenes in which a boat runs amok in a busy harbor.
All of this makes "Boat" a perfect example of an escapist '60s comedy. Day sticks to the independent woman whom Mother would love for you to bring home if being scorned is not causing her to "Hulk" out. There also is ample good clean slapstick and holding up the military-industrial complex to gentle but well-deserved ridicule.
Archive does equally well regarding the DVD extras; we get three entertaining featurettes related to the film, the highly stylized Chuck Jones Oscar-winning cartoon "The Dot and the Line," and the theatrical trailer for "Boat."