The sleight of hand with the map and secret photography was seen again, in a slightly different way, in the James Bond film La spia che mi amava (1977).
One of a number of Popeye shorts that were sent to Asia in the 1980s to undergo a redraw and colorization process.
The name of the island is Cash and Canary. That's a play on both Cash and Carry businesses as well as the Canary Islands.