The most notable is the flood itself. The Epic of Gilgameš comes from Mesopotamia, a land that is prone to flooding. If it (the flood myth) didn’t originate here, it certainly would have resonated with the people. This is in opposition to Israel, where the Noah flood myth comes from. Israel is a dry desert region of the Near East. Though it gets some rain fall, it’s pretty minimal.
There is also a portion of the story (Tablet XI, col i:7–40) that directly parallels Genesis 6:19–7:9. In this section the deity Utnapishtim tells Gilgameš about the impending destruction of humanity by a worldwide flood. Then the god Ea tells Gilgameš to “build a barge” and take specimens of every living thing on board.
Following this (col ii:58–94) there are specific instructions with the measurements of the barge which are comparable to the units of measurement for the ark.
Col iii: 96–144 talks about all of humanity becoming clay (what happens when you get the red sand of the Levant, called adamah in Hebrew, wet? It becomes clay. What was the first man made out of in the Genesis account? Adamah.
Then the barge rests atop Mt. Nisir, as opposed to Mt. Sinai.
Column iv: 145–98 mentions releasing a dove, then a swallow, and finally a raven to look for land once atop Sinir. Once the raven doesn’t return, Gilgameš releases all the animals, and then he prepares a sacrifice that the gods find pleasing (Genesis 8:21–22).
Aside from the Noah story, there are parallels with the creation story. Including a serpent and a tree of life.
I hope this answered your question 🙂