- Joker and Harley's relationship is more abusive in the novel.
- Joker has a much larger role in the novel.
- More of the characters' backstories are explored.
- Some scenes deleted from the film are featured in the novel.
- It is explained how Joker survived the helicopter crash.
- June Moone and Rick Flag's relationship is expanded.
- Joker's henchman Jonny Frost has a larger role.
- Several scenes from the film are extended.
- Batman interacts briefly with Harley Quinn after he saves her.
- Navy Seals have a larger role.
- Most one-liners deleted from the film are in the novel.
- Enchantress is more menacing than in the film.
- There are more fights with Enchantress' minions.
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