Claire Holt (Emma Gilbert) never returned for the show's final season or the final episode.
When the gang graduates and the names are being called out, the first name to be called is Lucy Fry. Lucy Fry plays Lyla on the spin-off series Mako Mermaids. What's more, it actually is her in the show. She can briefly be seen sitting back down adjacent to Bella.
The characters Cleo and Rikki are the only people to appear in every episode.
Last episode of the series.