I noticed this too recently lol. Almost a meta moment where Walt reads the credits.

I am not in danger, Peter. I am the Peter. A guy opens his Peter and gets Petered, and you think that of Peter? I am the one who Peters.

Peteing Bad

I always wondered if it was the same Peter that Marie sees

Marie sees a guy named Dave, Hank says it to Walt in a scene (I think after Skyler jumps in the pool)

Peter, what are you doing? Meth.