Is it true that the makers really copied Vertigo, or was it really original?
Manichitrathazhu story is influenced from a tragedy that happened in Alummoottil Tharavadu, a famous central Travancore family, in the 19th century. Here heroine suffers from personality disorder and some strange things happen, solves problem with exorcism and psychiatry.
Where as in Vertigo, a retired police detective suffering from acrophobia who is hired as a private investigator to follow the wife of an acquaintance to uncover the mystery of her peculiar behavior. This novel is written by Boileau-Narcejac. Hero suffers from acrophobia.
There might be few scenes borrowed from Vertigo.
I don't think Manichithrathazhu shares any similarities with Vertigo. Also to me, remakes of Manichithrathazhu often felt like inaccurate description of Ganga's medical condition (her anger directed at Hero in these movies, which could be a deliberate detour from original narrative to give more screen time to Hero).
Manichithrathazhu script is inspired from the case dairies of a Psychiatrist. Original movie has decent medical accuracy in which it portrays Ganga, a patient suffering from Dissociative identity disorder. Split personality / multiple personality have its roots in child-hood trauma (sexual abuse and other trauma, including dejection). Lonely childhood of Ganga has enough clues to establish roots of DID. More importantly Manichithrathazhu also has strong themes suggesting that the dejection from Nakulan could have triggered Split personality in Ganga's adulthood. Watch carefully two scenes when
Over all it feels like Manichithrathazhu is a serious attempt to portray DID and not inspired from Vertigo.