The photos above show a screen block at its most ugly! happens when you flood the screen too many times and the ink begins to dry and stick into the smaller areas of the screen, for example, corners, fine lines and detailed patterns in illustration. This is generally a cumulative process, and you can prevent it by noticing it early on and immidiately washing the screen.
Double image: Literally done by doing too many pulls when using rickety print beds, the air bed keeps the paper in place, but the framing structure itself (which keeps the screen in place) moves from pull to pull. I just had to trust that one pull was enough to get even ink coverage - because it was!
Bad registration - this was happening for me because I was rushing into the printing process when doing the registration process, and therfor just not lining the images up properly on the truegrain, and also because the truegrain had too many test prints on it, which made it confusing when trying to register my screen. Its all part of tightening up my print practise though, so i see it as neccessary mistakes to make, as long as i realise that I have to be more patient, in general, when it comes to screen printing.