So, I got Heavy Rain for Christmas (yay). I just finished the watch shop and wonder if I missed anything while wiping away fingerprints.
 
I wiped off both phones, the entrance door, magnifying glass, 3 glasses, bottle of scotch and the ballerina box that Lauren touched. I ended up at the police station, so I think I missed something. I just don't know what. Any ideas?

The window? I think... It's been a long time.

I must have missed something as well.  It's been a long time since I played the game, but I ended up with Shelby and Lauren in the police station as well and didn't know what I had missed.

There's a window Lauren leans on, not the one where the ballerina is, one to the left. I'm pretty sure that's the only thing you're missing. I know because I was trying to get all the endings recently and had to check a walkthrough for this chapter.  
 
Terrific game hope you enjoy it as much as I did. It has its flaws for sure, but damn if we're not getting to great interactive storytelling.