Charlie tells Willie to put the word out on the coconut wireless. This is slang in Hawaii for putting the word on the street.
Later in the episode when the Lovejoys are planning a scam to raise cash to get off the island, they tell their daughter Melissa to go to the movies. A G rated film. She responds GP instead. The GP rating was created and used from 1970 by the Motion Picture Association of America and meant all ages ages admitted but parental guidance suggested. The rating was just above a G and inferred the film might have some content not suitable for all audiences. The GP rating was changed in 1972 to PG.
Andy Griffith starred in a similar role in the Matlock episode can you spare a dime about a grifter couple who steal mob money when one of the grifters is murdered by a mob hitman
Andy Griffith, playing the part of Arnold Lovejoy, is wearing a short sleeved "Hawaiian" shirt. It is red with large white flowers printed all over it. It appears to be identical to the shirt that Andy Taylor reluctantly wore, at the insistence of Aunt Bea, in the1965 episode of The Andy Griffith Show "Off to Hollywood".