Probably not "maladministration" on its own, but it doesn't inspire confidence!
I would write to point out the mistakes, and I would also seek to obtain a copy of the clerk's notes to check for any further errors.
According to the Dfes, "Where a request has been made under the Data Protection Act for access to personal data contained in the records of proceedings, whether that data should be disclosed will depend on a number of factors including: the identity of the person making the request; the nature and individual circumstances of the appeal; the way in which the data is held; and the interests of any third parties identified in the data. Appeal panels or clerks may therefore wish to obtain their own legal advice before responding to such a request."
If the authority refuses to release the notes, I would ask them to put their refusal in writing, together with their reasons.
I would then complain to the ombudsman about those aspects of the appeal that appeared unfair.
The ombudsman will almost certainly ask to see the clerk's notes if he decides to investigate the complaint. He has the powers of a high court judge, and the authority cannot refuse his request for the notes.
My experience was that the ombudsman (London office) routinely sent a copy of the clerk's notes to the complainant in due course. There are, if I recall correctly, three different ombudsman offices for different parts of the country, but I would have thought they would all have the same policy.
Incidentally, when asking for a copy of the clerk's notes, it's important to state that the request is being made "under the Data Protection Act".
It's true that the notes do not have to be a verbatim record. This can be tiresome, although sometimes the gaps can be to the advantage of the appellant! For example, if the notes do not show that a possible disability was considered under the DDA, or that a piece of evidence which the appellant put forward as important was properly considered, or that there were clear reasons justifying the panel's decision, then a complaint is quite likely to succeed, even if the reality is that the panel dealt with these matters correctly.