Here's the action of the pocket lining join! This looks a lot like a 3-needle bind-off, where you use a spare needle to hold the live stitches that you're joining together with your knitting. My husband took this quick video while Netflix was paused and the dogs were fussing about, so the lighting isn't perfect... and no voice-over :)
Here's my blog post, describing what is happening:
http://sageyarn.wordpress.com/2015/05/09/spring-kal-pocket-lining/