The novel of Revenge of the Sith is canon. It aligns with the established Star Wars canon framework and adds depth and detail to the events depicted in the movie of the same name.
The plot of Revenge of the Sith centers around the final stages of the Clone Wars and Anakin Skywalker's descent to the dark side. It's a complex and intense story with lots of action and drama.
It's hard to say exactly. Different people might have different opinions on what constitutes a deleted scene. But usually, these could be scenes that were cut during the editing process for various reasons like pacing or story flow.
One of the main themes is the fall of Anakin Skywalker. His journey from a Jedi Knight to Darth Vader is central. Another theme is the collapse of the Republic. The political intrigue and manipulation that lead to its downfall are explored. Also, the theme of friendship and betrayal is there, as Anakin betrays his friends and the Jedi Order.
Some of the deleted scenes in 'Pulp Fiction' might have added more depth to certain characters. For example, they could have shown more of the backstories of Vincent Vega or Jules Winnfield. However, without seeing them in the final cut, it's hard to say exactly how they would have changed the overall feel of the movie. But they probably had more of the same edgy and dark humor that the movie is known for.