By the way

His mother will be coming for dinner tomorrow, and, by the way, she recently sold her collection of ceramic eggs.

[…] I had counted on a life-lease of the profits, whereas I only received those of a few short years. But this is by the way.

“A very welcome, kind, useful present, that means to the parish. By the way, Hopkins, let this go no further. We don't want the tale running round that a rich person has arrived. Churchill, my dear fellow, we have such greedy sharks, and wolves in lamb's clothing.[…]”