I feel like there is an expression similar to that, or "the devil's in the details", but both of these are not quite right.

They, too, were staring at the wreck, a similar tense expression on each face.

But a similar expression was lurking near her own muzzle.

As one person, they both turned, and their faces bore very similar expressions.

Notice the chick to the right with the similar expression.

A similar expression is obtained for the mean activity coefficient.

He looked down and saw a similar expression on Oy's face.

Those sentiments followed a similar expression from the President last week.

I've seen a similar expression on my sister's face once or twice before.

Jake glanced around, saw similar expressions on the faces of the others.