Tall objects such as trees and skyscrapers are more likely than the surrounding ground to produce one of the connecting sparks and so are more likely to be struck by lightning. Mountains also make good targets. However, this does not always mean tall objects will be struck.
The lightning discharge heats the air rapidly and causes it to expand. The temperature of the air in the lightning channel may reach as high as 50,000 degrees Fahrenheit, 5 times hotter than the surface of the sun. Immediately after the flash, the air cools and contracts quickly.
The CW ordered 22 episodes for the season, but interference from the 2007 08 Writers Guild of America strike ultimately limited the season to 16 episodes. Some storylines were thus postponed, which Kripke felt ultimately benefited the season by forcing the writers to focus on saving Dean.
With 14 previous seasons to get through, most running 22 to 23 episodes each, catching up with Supernatural in time for the series finale is not only a Herculean feat in binge watching, it's also impossible.