The following issues and questions regarding some sections of several suttas in DN may fit better under a topic ‘What the Buddha’s followers got wrong or added in’. But here they are, based on the Buddha’s advice to Kalamas and on a good intention to know things as they really were:
DN 14: Mahāpadāna Sutta, re: previous Buddhas
Q1: How long is an Eon?
Q2: Did those previous Buddhas live on Earth? If so, are their descriptions consistent with our current knowledge of human history and cultural development?
Their extremely long lifespans are not consistent with any real evidence from human history. Also, class identities such as aristocrat, Brahmin etc. are very recent human invention, a few thousand years old at most.
Q3: Did that story about previous Buddhas come from Vedas? Is that sutta found in Chinese Tipitaka?
DN16: Mahāparnibbāna Sutta, re: how to prepare the Buddha’s corpse for cremation
Q1: Why would a Buddha put so much importance on embalming or wrapping up a body for cremation? Is that consistent with His teaching regarding the body, letting go, non-attachment?
Q2: Was such ‘embalming’ an old Indian custom, recorded in Indian texts? Is such procedure recorded in Vedas?
DN26: Cakkavati Sutta,
It seems to me that the story (parts 2 to 8, from King Dalhameni to Buddha Metteya) may have been imported and inserted between the first and last parts of the original sutta. It is not consistent with what we now know about human and animal lifespans throughout Earth history, or with human evolution based on real evidence.)
Q1: Is that sutta found elsewhere in Pali Tipitaka? Is it found in Chinese Tipitata? Is such story found in ancient Veas or other Indian texts?
Q2: For example, are such long and short lifespans of people plausible? What world is that story describing?
DN27: Aggaṅṅa Sutta, re story of origin
Again it seems to me that the story of origin of various things is an import from ancient Indian culture. Added in. For example origin of Sun, Moon, constellations, etc. Each culture had stories of origin, with some seeds of truth in them.
Q: Is that sutta found in Chinese Tipitaka? Is it found elsewhere in Pali Tipitata? Is there similar story of origins in Vedas or other Indian writings?