Jack and Martha were mentioned only in passing; so was Mark.

Various people had mentioned in passing to trustees over the years that they might want to buy a vault if one became available.

Canada was only mentioned once in passing during the presidential debates.

Chewbacca does not make any appearance, but is mentioned in passing a few times.

Bullies will often use what you have mentioned in passing as a weapon.

He is mentioned only in passing by one of that novel's protagonists.

The defense introduced none of that evidence, however, and it was mentioned only in passing by prosecution witnesses.

Still, a figure that was mentioned in passing recently conflicts with this information.

It was the cult, a system of beliefs he had heard mentioned in passing back on Earth.

She was mentioned a few times though, in passing and a pregnant Emma left to visit her near the end of the series.