I noticed that the lightning was mostly sheet lightning, as I find it tends to be here in B.C. as opposed to Ontario, where I found that bolt lightning was the norm. I always thought that these were two different types of lightning that occured more often in some places than others.
Then I found out by searching online that sheet lightning is just a lightning bolt that is hidden by clouds.
I'm an idiot.
Anyway, if you go to this Wikipedia page on lightning, there is a very cool animated picture of cloud-to-cloud lightning which IS different, and which I have only seen once that I can remember, in Dallas, Texas. The page also has pretty much everything else you would ever want to know about lightning, unless you are some really lightning obsessed UFO weirdo or something, then you may want to look further.