Because I got this item a couple of months later than its release, I'm not too sure about the extra promotional goods. I do know that there are also exterior posters and these exterior postcards of the individual members, but I'm not sure how people got the postcards.
Disc 2 contains three special features: the movie trailer (1 min 17 sec), the behind clip (19 min 44 sec), and the commentary (1 hr 26 min 32 sec). The behind clip is a lot more lighthearted, showing the members enjoying themselves on their free time throughout the world tour. It usually focused on just one or two members at a time. It was so cute when Hoya was speaking English! And it was cool seeing the CEO buying that yellow LV tote for Sungjong; he used that bag so often!
The commentary shows Infinite viewing the documentary and giving their random comments, all while the documentary is shown in the bottom left corner for the viewer's reference. They first spoke about their impressions of the trailer, and ended with their reflections of the world tour and the documentary. My random thoughts: It was also nice seeing the members a few months after the tour finished. It was so hard for Myungsoo to watch his chapters. And I had originally thought that the narrator was so boring, but then Infinite pointed out that it's the CEO narrating haha.
I miss Infinite so much, and watching the DVDs (more so the special features instead of the documentary) made me so happy again. These DVDs are like a longer version of all of those short special features in Infinite's Japanese limited albums with DVDs; I always like watching those DVDs but they're always too short for me to take the time to watch them, so it's nice having full length features such as Grow. I really do hope Woollim will officially release some sort of documentation of Infinite Effect, whether it be a concert DVD or a documentary DVD.