"Changing" Gd's "Mind" with prayer: Succah 14a
In creating Adam and Eve as One form or Two: Ketuvot 8a
Possible Retraction of Gd's Oath Barring the Generation of the Desert from Entering Israel: Chagigah 10a
The Talmud asking, "Can it be that Gd would have uncertainty [as to the facts of a story]?!": Berachot 3b, Gittin 6b