2. The handwriting of the same person is different: this can be used for forensic identification-handwriting identification.
3. The signatures of surgeons are different. It can be considered that the hospital has not fulfilled its duty of care.
4. Nursing records: the same as 3.
5: The statement is invalid because there is no signature of the patient or family members. If the family members don't know, it means that the hospital has not fulfilled its obligation to inform.
I suggest you go directly to the formal judicial expertise office for medical fault identification.
... please refer to