Known typos in the book Groups by Jordan and Jordan:
none reported yet.
Known typos in the lecture notes:
Lecture 14: Near the end of the proof of Cauchy's theorem, I wrote "there exists e\neq g\in G". This technically should have been " there exists g\in G with g\neq e".
Lecture 15: When describing symmetries of the tetrahedron, I wrote "edge-face rotations" when I meant to write "vertex-face rotations".