. . .he did say that he even stopped reading scripts, that's why he's always looking at a pad or a console, he had his lines taped to them. Which I think as an actor even if you're not particularly happy with your character or something, that's incredibly unprofesisonal and disrespectful to the rest of the actors
Maybe he's not a quick study. When I did plays, it would usually take a month for me to get the script out of my hand, so I could never do a new show every week.
Or maybe he was taking a cue from Marlon Brando, who was notorious for not memorizing his lines. He'd leave index cards hidden all around a set with his lines on them, believing that allowed a fresher delivery than memorization.