Sherlock's room, hidden the difference. I'm stuck on 4 objects left to find. Anyone managed to get..

With the Spot the Differences levels (especially the mirrored ones) I keep a close eye on the center; the line that divides the 2 screens. I slowly move the screen checking that everything is the same on both sides of the immediate line. That way it's hard to miss something. Try it. You'll see what I mean.