Contradiction with Genesis 5:3
Suggests Adam had Seth when he was 130 years old, but does not provide information about the gap in years since Abel’s death.
Genesis 5:3: And Adam lived an hundred and thirty years, and begat [a son] in his own likeness, after his image; and called his name Seth:
Contradiction with Genesis 4:17
Mentions Cain having a son and a city named Enoch, indicating developments in Cain’s line that contrast with the focus on Seth.
Genesis 4:17: And Cain knew his wife; and she conceived, and bare Enoch: and he builded a city, and called the name of the city, after the name of his son, Enoch. [Enoch: Heb. Chanoch]
Contradiction with Genesis 5:4
Notes Adam had other sons and daughters, which expands the lineage beyond simply Seth being the replacement for Abel.
Genesis 5:4: And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters: