Haa, all of them. Here are a few.
1. Why god would introduce to Adam and Eve a weapon and the concept a of weapons when he kicked them out of Eden. Flaming Swords.
2. Flood. I could not suspend disbelief after a while. So utterly stupid and falsifiable in a 1000 ways.
3. Balam. That a talking donkey would not be unusual to him. Instead he argues with his talking donkey.
4. That god would somehow codify slavery as ok, that jesus had nothing to say about it.
5. That a girl could get raped, but if no one heard her scream out she could be killed.
6. That a raped girl could be forced to marry her rapist.
7. Generations (haaaa)
8. The whole order of the creation account being somehow accurate. (its not)
Really everything.