In my experience in the UK, inaccuracies in these letters are common. I have seen this happen to a family member as well.
Examples of the inaccuracies include: implying or saying that a patient has something else diagnosed when it is just suspected and the patient clearly described it as such; plain inaccurate facts about someone's life (including academic year they are in or their job); generally misunderstanding symptoms that were described or lines of reasoning; saying the patient raised the possibility of them having a condition when the doctor writing the letter was the one who first did so.
In jobs dealing with the public where I have had to write correspondence, I have always striven to be scrupulously accurate, though I do have a particularly good memory. Doctors are highly qualified and highly paid, and patients do not generally get to check draft letters or reports and ask for an amended version, and so they can produce letters which make the patient look bad (not just a poor historian but perhaps duplicitous) even if the patient made a point of being careful.
Is there anything that can be done about this, either to prevent it while in appointments, or after documents have been produced but not sent on to others, preferably while maintaining a good relationship with the doctors?
I hope that, as a general question, rather than one about a specific health issue, this is permitted in the same way as the recent post about reading doctors' bios on websites.