hehe, I guess simple psychology like changing the wallpaper works. Personally I like to compare file differencies.
However, I am not into leaked builds though, more so I compare differences betwen files altered by Windows Update and new releases like the difference between 1511 and 1607.
With that said, it is a proven path as a new wallpaper is a good initial verification of build if used. You should however always tap [[B]WinKey[/B]]+[[B]R[/B]] and type [B]winver.exe[/B] and hit [[B]Enter[/B]] to bring up the version window… The wallpaper is easy to fake and in a worst case scenario could cause you to choose the wrong solution to a challenge