The first fish Gilligan catches starts out as a Swordfish (stock footage), then becomes a Dolphin (stock footage) and finally ends up as the fake shark on the beach.
The story starts with the SS Minnow beached on the island and Gilligan asleep on deck, while the others are on the beach. Gilligan and the others are all wearing their familiar outfits. But the credit sequence shows both the Skipper and Gilligan in yellow "Sou'wester" slicker coats and hats fighting the storm that beached them. So Gilligan at least should still be wearing his yellow slicker when he comes around.
To the text "The boat is called the SS Minnow, but "SS" stands for "steam ship". A small boat like the Minnow would be powered by diesel or gas engine" the phrase "which would carry the initials MV for 'motor vessel' " should be added.