Did Raymond have other problems besides Autism?
I recently watched the movie again for the first time in a few years and yes Raymond is portrayed as being Autistic but probably also was low functioning Autistic and not high functioning at all, there are varying degrees of this illness and he had the lower level spectrum.
I also believe that Raymond was severely mentally retarded and bipolar in addition to being autistic but because this was released in the 1980s and he had been living in the care of the institution for years they did not know all of his other problems because his autism made him hard to diagnose.
His mental retardation and mood swings suggest that he was bipolar but not diagnosed as such, they clearly overlooked his condition and misdiagnosed him as being only a low functioning autistic savant, if he was tested professionally today he would be diagnosed as being Low Functioning Autistic Savant, Mentally Retarded and Bipolar, along with obsessive compulsive disorders.
Raymond basically had issues that the limited medical and mental health professionals of the 1980s were to stupid to detect, today they would have better training and would know him for what he is.