Page 4 - I think the second one is Skyquake. The left one looks familiar though.
Page 12 - Most appear to be generic bots, but I see Sunstreaker in the second bottom panel.
Page 18 - I was thinking maybe an Aerialbot, because the other 2 on page 19 look like Slingshot and Fireflight.
Page 20 - One above Soundwave would be Slugslinger. The one above that is familiar, but only because of the shoulders. The one behind frenzy reminds me of Gobot Leader-1.
I only just noticed that they used the Movie Universe Camera Real Gear character mould in that group shot as well, which I think they snuck in, because I think they aren't allowed to touch the movie universe.