List 2 common mistakes in rehabilitation programs

I’m not sure if you are talking about the mistakes people have made to get into a rehabilitation program, or the mistakes rehabilitation programs make.
So I’ll put both.
2 common decisions people make to get into those programs are drug addiction, and alcohol addictions.
2 common mistakes the rehabilitation makes is, making people talk who don’t feel comfortable talking about those thing yet, and hiring people who have no empathy for the patients.