I'm not taking the agent's side in this by any means. He should have just sucked it up and we'd all have been none the wiser.
However..
Especially if he/she claims to be a GOVERNMENT EMPLOYEE and cannot fill out forms correctly.
1. The original accreditation for the cancelled flight was presumably OK.
2. The flight number on the form was changed (the 'discrepancy' ?) by an AA CSR.
3. I doubt the agents prepare these forms themselves.
And without being there, I don't know who started the willy waving (to quote Kate Adie). If the agent was such an a'hole why did the Capt. only file an incident report after it all became public ? Smacks of CYA to me.