welt pocket for pants- help on last step

I'm working on the final step of the welt pocket for pants (step 11 of sew the welt pockets). I followed the tutorial on the blog to double check and my pants pocket looks like the ones in the picture here (http://oliverands.com/community/blog/2013/10/tutorial-how-to-sew-a-welt-pocket.html) with the interfacing showing and the seam pressed towards the pocket bag. But that doesn't look like the image on step 2 of "prepare the trouser back" where the interfacing doesn't show and the seam looks like it was pressed open (maybe?). It also seems like the pocket bag fabric is hidden really deep in the pocket. What am I missing?