Thank you !
The different variations possible are the signature, the font used (there's a typewriter or handwriting font specific to each character) and the character's name that can be misspelled, or their assigned troops being written in roman letters numerals instead of the arabic letters they usually use (or the reverse). There is a bit more, like the falsified message often using the word "target" instead of "objective", but we didn't put it as a lone clue because it seemed a bit unfair to players.
The game is definitely lacking some clearer feedback, and a bit more balancing I think
I hope you had a nice time playing it regardless