My T has said on a few occasions, "I know I've made mistakes with you and for that I'm sorry but it was a learning experience for both of us."

Also, recently the session was ending and I was doing my usual thing where I start to cry because it was almost over.
T: I'm nothing
Me: You're not nothing
T: But I am. I'm nothing. I'm nothing more than a voice telling you to wake up.
Me: That's not true! (crying harder) You're not nothing.
T: I am. You are holding me in too high esteem.

The following session he starts with an apology.
T: I am sorry I said that to you.
Me: I know why you said it
T: I don't think that you do which is why I am apologizing. It wasn't fair to say that to you. So, whatever you think of me that's OK.
Me: Cool! (big grin)