Spoilers

[BigTransformerTrev]

Both OP and BB have some Hope and some Hate posters on that wall.

Well whats the thinking there then? Considering the posters look pretty much exactly the same, are we to believe that the same group are making both supportive and dirisive posters about the Autobots? If the posters looked like they were made by two different groups it would make more sense.

[Deonasis]

Two thoughts.. maybe it will be in the movie for such a short and blurry second that it doesn't need to be too thought out. To me I thought it looked like all the posters were not applied to a wall but just a big vinyl sheet of 'posters' against a wall which also adds to the cheap (or easy) background prop idea.

Or there are a lot of hate posters and towards the end of the flick humans start applying more hope versions as they realise Optimus only has a 'thing' for slicing robotic faces and he poses no harm to them.