Sabrina is mainly jealous because Harvey and Brad are spending a lot of time together. Brad also helps Harvey write an article for Sabrina and she refuses to accept that it is really good.
Zelda gets jealous when Mr Kraft's brother comes and instantly falls for Hilda and takes her to all the places Zelda would like Willard to take her. She learns to control her jealousy by realising that if ashe wants Willard to take her places she should ask him herself. Sabrina takes a trip to the Jealous Sea where Salem shows here that she can be happy for other people without diminishing what she has.