Once again, Mr. Roarke refers to USA as "the mainland" when he tells the woman that her mother has taken "the next plane back to the mainland'. This implies that Fantasy Island is thus Hawaii, or at the very least, part of USA, but this is a mistake: in The Beautiful Skeptic/The Lost Platoon (1982), he refers to the USA as "that country" and it is understood since the beginning that Fantasy Island is its own country.
In the season 7 opening, the plane arrives at the dock and two of the ground crew open the upper hatch and the door. But when Mr Roark and Lawrence arrive a moment later, there's a clear view straight up the dock, showing the hatch and door clearly closed.
The actress playing the daughter repeatedly calls her mother "Maggie".