I dont even look at the holders much now. Both fakes in the middle have different types of holders.
The left fake has what looks like a very similar holder to a real PSA one, if not a real one, if you look at the gap they make in the upper card corner area ("corner cutout to see cards corner"), it the same size and design as a real holder. Other parts of the holder are similar if not exactly the same.
The right fake has a completely different type of holder, its "corner cutout to see cards corners" are much larger, and on a better scan its obvious they are not exactly the same as a real PSA holder when you compare them close. If I remember right this type of fake holders has corners (outside corners of the holder) that are more rounded than the real PSA holders.
PS. The best place to look is the flip,
Many of these Craigslist Fakes have the same Bar Code
If you go to this old post where these Craigslist fakes were first "outed"
http://www.net54baseball.com/showthread.php?t=89073
Go to page 5 and there is still a picture of many of the flips lined up together and you can see they are all the same.. Bowman Mantle, T206 Cobb, '54 Aaron, Goudey Ruth, etc. all have the same bar codes.