I really like Slaughterhouse 5, have you read it? 
Yes!  Many times... i used to read it once a year when I was younger.  Not enough time for that anymore.
I didn't know that Kurt Vonnetgut wrote it, did you? 
Yes.  I love his work.  I have read most of his novels.  I really love the novel Galapogos.  It is a dark comedy about the re-evolution of man.  Very funny yet poignant.
Kurt Vonnetgut doesn't write much stuff that I like other than Slaughterhouse. 
Interesting.  His style is so unique and there is a definite common thread running through all of his work.  I would think if you liked one of his books you would like most of them.  You should give more of them another try.  He is often incorrectly characterized as a science fiction writer.  He is really more about the problems inherent in humanity.
In Slaughterhouse-5 there were great characters and in the movie in 1972 the characters came to life. 
The movie was interesting.  An unusual telling of the story, but good.  Harrison Bergeron is another Vonnegut work that was made into a film.  I've never seen it.
I can't believe it was made so long ago, I heard a few high schools banned it, probably the liberal cancel culture. 
I think there are aspects of the novel that are misunderstood.  There is some violence and sexuality and blasphemus content...  But the good points far outweigh all of that.