The fictional island name of Cascara which contained a wellspring of mineral water with a 'slight laxative effect' was somewhat of a spoof, as the plant Cascara, (whose scientific name is 'Rhamnus purshiana'), is said to produce its own laxative effects.
When Ms. Baxter speaks to her husband by megaphone, her voice sounds equally amplified despite the distance between mouth and the microphone varying wildly.