I felt left out so I decided to have some crashes today
In that exact place. Although I did cross the bridge originally yesterday with no problem, I quit before I got to the next book (literally, it turns out, seconds before I would have activated it), maybe that messed with my progress?
So I came back today, realizing I should be playing in a new book and crossed the bridge to activate it. You will notice that the Newton cutscene is slightly different from the right one (Newton is more to the left than he should be). Then the loading screen appears and sends you back to the home screen.
I tried it three times to make sure, then logged out of PSN...it worked first time.
The obvious conclusion for these glitches and crashes are because of the online part of the game. What exactly is the game doing using online while you're playing in story mode alone? (especially just before a cutscene)
And it's as I thought with the Pop It. It's searching the hard drive for screenshots. More screenshots, more lag.