For those who didn't read a "history of mindfulness" by bhiikhu sujato, here are some topics which I found particularly interesting.
1°) The satipatthana sutta was originally in the samyutta nikaya, but moved later to the majjhima and the digha nikayas, because those books had no mentioning of the 4 Establishments of Mindfulness.
2°) Some parts were added in this process, to make the text longer:
- the sati of the body concerned only the parts of the body (not the breath etc.)
- there was non mentioning of the contemplation of impermanence
- the part on the dhammas mentioned only the 5 hindrances and the 7 factors of enlightenment
3°) Clear comprehension (sampajana) was distinct of mindfulness (sati), and was either in the beginning of the text (i.e before the 4 establishments of mindfulness) or even not in the text.
4°) The 4 establishments of mindfulness were more a preparation to jhana than to vipassana.