On a more serious note: I think he is absolutely right.
On a serious note, we are all different people and have our own opinion about things.
It was a serious note on a day of fun.
On a more serious note though, these prices are getting out of hand.
On a serious note, the main bad thing is the added complexity.
There was a more serious note in the secretary's voice now.
He rose, trying to end the meeting on a positive if serious note.
But on a serious note, I hope he fights again.
I would like to end on a slightly more serious note.
The Commission should take very serious note of our position.