Contradiction with Genesis 24:3-4
While Genesis 25:20 mentions Rebekah as Isaac's wife from Padan-aram, Genesis 24:3-4 highlights Abraham's desire for Isaac to marry someone from his own kindred, which could be seen as a geographical and familial inconsistency.
Genesis 24:3-4: And I will make thee swear by the LORD, the God of heaven, and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell:
Contradiction with Deuteronomy 7:3-4
This verse advises against intermarriage with other nations to prevent turning away from God, contradicting the idea of seeking a wife from outside one's immediate familial region as in Genesis 25:20.
Deuteronomy 7:3-4: Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.