If you use a narrow browser at some point when you try drawing a text "box" you end up with a load of undefined's
I can see this is coming _out_ of textgrid.js (but I'm not sure where it gets its input from)
To see this in action set your browser to about 360px wide and load up Curses! as it happens on the first screen here - You might need to refresh a few times to get one of the wider ones (Curses are like young chickens... fits)
Why does this matter much?
It limits the mobiles to a subset of titles.
Testing on a Blackberry (smallest screen I have is a pre-production Q10)