Contradiction with Genesis 30:4
Genesis 30:4 states that Rachel gave Bilhah to Jacob as a wife to bear children for her. This is not a contradiction but rather a background to Genesis 35:25, showing her role in the family.
Genesis 30:4: And she gave him Bilhah her handmaid to wife: and Jacob went in unto her.
Contradiction with Genesis 29:30
Jacob loved Rachel more than Leah, which contradicts Genesis 35:25 only if interpreted to suggest a change in dynamics, but it doesn't directly oppose the verse.
Genesis 29:30: And he went in also unto Rachel, and he loved also Rachel more than Leah, and served with him yet seven other years.