I need to watch the last week's episode. Supreme Marvel's comments just made me more curious.
Mikasa is getting a manga spin-off, I think?
In each manga volume Isayama puts in some comedy fake spoiler pictures. The one you posted is about Mikasa, sorry, "Mikarin" being an idol. I don't know what everything on the page means, but I do believe it does say "Favorite things: Eren" in the profile stuff on the bottom left. There's also a few more of these, like one of Armin tripping on some stairs and smashing his shin and screaming in pain, and Jean's mom catching him doing something personal in his room.