Well,'sinopsis' might refer to a synopsis in Indonesian. 'Bahagia' means happy. 'Bukan' is 'not' and 'bidaan' could be something like a show or performance. So perhaps it means that a happy synopsis is not for a novel. But it's a bit unclear without more context.
You could say 'Saya menemukan bahwa sinopsis bahagia bukan bidaan novel ini sangat menarik.' which means 'I found that this happy synopsis which is not for a novel is very interesting.'
Plastic shrink art is a creative process where plastic sheets are heated and shrunk to form various shapes and designs. It can be related to cartoons when used to create characters or scenes from them.
It could be part of the story to create a peaceful or funny moment. Sometimes, a sleeping character adds an element of surprise or sets up a future event in the cartoon.