This movie has become somewhat obscure, partly due to it's multiple titles (The misleading "Mystery of Kaspar Hauser") and due to Herzog's own focus on his work with Klaus Kinski. However, if you are a fan of Herzog, neither this nor "Stroszek" should be overlooked. This has less to do with the historical Kaspar Hauser (and there are inaccuracies, as with "Aguirre") than a harrowing look into alienation and exploitation.
I will avoid spoiler details, but the scenes with the circus and the churchyard are especially evocative. This is a restrained film, as subtle as anything Herzog has done. If you are expecting grand historical panoramas, look elsewhere. If you want a harrowing view as to how we are all alone even when in the company of others, and a view of how we force our expectations on others, see this film.
I will avoid spoiler details, but the scenes with the circus and the churchyard are especially evocative. This is a restrained film, as subtle as anything Herzog has done. If you are expecting grand historical panoramas, look elsewhere. If you want a harrowing view as to how we are all alone even when in the company of others, and a view of how we force our expectations on others, see this film.