First, here's a little snippet from the Nunc Licet Bible Study, where Rev. Jonathan Rose explained briefly (before May 21st) why the end of the world wouldn't happen on May 21st. (Over 5000 views so far - not bad!)
And then here's another great video from Curtis Childs. This one is about the desire to to say, "Ha ha! I told you so!" to the people whose predictions about May 21st didn't come true. Honestly, you should just subscribe to his channel (offTheLeftEye) already.