Dr. Linebarger[1] wrote first a textbook (for the US army) and then a book (for the general public) on "Psychological Warfare" which incidentally contains a section, with an outlined method complete with mnemonic acronym (STASM), on media analysis.
"If you agree with it, it's truth. If you don't agree, it's propaganda. Pretend that it is all propaganda. See what happens on your analysis reports."
Mad magazine used to run "reading between the lines" pieces.
[1] A while ago I learned The Game of Rat and Dragon is accurate insofar as felines not only have better reflexes than ours, they're among the best.
I'm skeptical that this can be done effectively