The trailer features some close-up shots of the sets such as the Great Hall, Ministry of Magic, and Dumbledore's office along with some new behind-the-scenes footage and interviews with Daniel Radcliffe (Harry Potter), Rupert Grint (Ron Weasley), and Emma Watson (Hermione Granger).
The merpeople had grayish skin and long, wild, dark green hair. Their eyes were yellow, as were their broken teeth, and they wore thick ropes of pebbles around their necks. They leered as he swam past; one or two of them emerged from their caves to watch
next year – london!