When I pasted a selection made with the Marquee tool there is a transform grid around the pasted selection. I use a MAC and Photoshop CS6 and would like to deactive a feature for this automatic grid, if there is one. Thank you.
If a tutorial took all the time necessary to describe every single setting that's modal (i.e., that affects Photoshop operation or what you see) the main message of the tutorial would be lost.
We all discovered many of these things like you did, and now you can pay it forward by helping others when they ask how to get rid of the transform border.