I'll scour a fair few games and look at their recent fixtures - the goals and corners 'usually' come in fairly easy. Then it's just a case of the bookings - I'll look at how bad their discipline is in general, and especially these days with refs being much more stricter. For Norwich, there was an average 4.75 bookings in their previous 3 games; for Plymouth there was an average of 3.33 bookings in their previous 3. So to me that's a pretty unlucky anomaly for their game together to have only had 1 booking.
I'll usually go for sides that like to attack, too - as that means the goals is more likely to come in, and more attacking opportunities leads to the likelihood of more corners.
There were 7 corners by half-time in their game, and obviously goals came in with ease. Then it was just a case of hoping for Norwich to lose their discipline.
For the Cambridge/Port Vale game, it was literally half-way there by half-time - 1 goal, 5 corners and 2 bookings.
I was very tempted to go for Over 2.5 goals/over 9.5 corners/over 35 booking points in the North London Derby - that came in very easily and the odds were about 5/1 I think.