Since I updated from 1.4.2 to 1.4.5 I noticed that spiders no longer get falldamage when they hit any kind of water before the ground. Even the water 7 blocks away from a water source.
And this was clearly not the case in 1.4.2.

And since this wasn't in any update notes I assume its a bug.

Here's a video showing the issue:
http://www.youtube.com/watch?v=5xSWkuHC3Ow