* Pixelated nudity in shows like Californication and The Man In The High Castle and films like Watchmen and The Godfather
* The Grand Tour had an episode which involved animal carcasses. All of it was removed.
My $0.02 on this difference between Amazon and Netflix. This is Netflix's primary business, while Video is an afterthought for Amazon compared to the retail business. A boycott of their retail business would be catastrophic, whereas a few people canceling their subscription over self-censorship is a non-issue.
Amazon can also potentially be shaken down for protection money. It would work like this. "Hi, we're from this political party and we're considering making these videos a major issue. Meanwhile, would you consider making a donation to our election campaign?"