Normally I don't like this episode. I mean it is not the worst, and everytime I watch it I want and try to like it more! And I have a lot of questions regarding this one but two of them always bother me a lot and I never found answer for them:
1. In the park Columbo asks Joyce (photo girl): "what do you do with pictures that you didn't sell?". She answers that she keeps them for 10 days and then throw away, so they go to see those leftovers. But they don't find anything interesting. Then Columbo asks: "what do you do with pictures that you didn't sell"? This is exactly the same question asked for a second time! and then she says she only has negatives of them. Is it some mistake? should have Columbo asked "what about the ones that you DID sell?"? Or I just don't get something here?

2. I know Columbo explains to Brenner that they found him quickly because somebody from real Henderson's office recognised him. But how? In that office nobody should have known Brenner I guess?

Anyone can help with that?

Matti, I think the first question was: "What do you do with the ones you don't sell", and the next question was: "Do you keep copies of the ones you DO sell". I least I thought it was something like that. She says they don't keep copies but they still have negatives. My memory could be off.

As far as another ad agency recognizing Nelson Brenner, I thought he was supposed to be a giant in the advertising industry and that any ad agency would know him. Did I miss something? The ad agency wouldn't know his victim, but because his cover was different. But Brenner's cover was as an ad exec.

I'm going to have to rewatch it tonight.

I just got to the part where Columbo asks: "What about the ones you DON'T sell?" and you're absolutely right. He meant to say "DO sell" and I guess he flubbed it and the director thought: "Nobody will ever notice it. I'll just leave it in". Well, here we are half a century later and you noticed it. Nice work.

Btw, I always watched columbo in italian and I'm pretty sure this mistake isn't present there, once he asks about those they didn't sell and then asks about those they sold.