I have a suggestion
You are using the double use of youtube - ie a video in lightbox and also a link above that leads to the external source - but it basically does the same thing.
When searching for sources on my site vbulletin search is very restricted as many movies are called The (something) etc etc
So we use a imdb code to search which brings back accurate results. tt1375666 is inception as long as the post has that information in it.
My suggestion if possible is instead of having a youtube link but maybe a result link (still trying to define the correct word)
So when pressed it searches for anything with imdb info of the movie of the week in it.
Search + this :
http://www.imdb.com/title/tt1375666 doesnt work but
search + this : tt1375666 does work