We still need Foundling? How about this? When the talk at the office is about how everyone in Metropolis is related to one another, when Lois indicates that there is a certain resemblance between Jimmy and Cat, the dialog veers off from the original script as follows:

CAT
Yeah, about as much resemblance as there is between Clark and Superman.

Cat notices that Clark has just walked in.

CAT
No offence, Clark.

Lois looks at Clark to see his reaction, and then, for the first time, really SEES Clark and sees that the resemblance between him and Superman is, in fact, quite astonishing. But she doesn't want to let the cat out of the bag, so to speak.

LOIS
Hmmm... You may be right.

Joy,
Lynn