These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
There's actually a specific historical reason that the debate happens. You see, after the nations we know today as Judea and Israel were founded, a system of scribes were set up to preserve the holy books, copying the books EXACTLY as they had been written. This was considered a profession you had to train for, and is one of if not the reason the Bible is considered a historical document. Now obviously, the scribe system hadn't been set up until long after Genesis, so the picture isn't going to be as clear.
What Do You Mean, It's Not Didactic?: Besides the creation story (no, we are not going to open that can of worms here), there is Melchizedek, the High Priest who gave Abraham and Sarah bread, wine, and a blessing in the name of their God. Some uphold him as a metaphor or foreshadowing of Christ, others just see him as some priest-king-dude who did something nice for Abraham and Sarah.
Isaac. His own father almost killed him. Later, his wife Rebecca and son Jacob conspire against him to trick him into giving Jacob the blessing.
Hagar becomes Abraham's concubine with his wife Sarah's consent and bears him a much-desired son, Ishmael. Later, once Sarah herself conceives and gives birth to Isaac, she has Abraham evict Hagar and Ishmael, who have to wander around in the wilderness before God intervenes.