I think like a lot of other writing issues, the decisions come down to necessity for the story and risk.
Anything - movies, music, technology, slang, etc... can date the work. And often it isn't a big deal.
A kid reading a book today that was written 20 years ago, or even 10-12 years ago, might wonder why the teen stranded with a flat tire doesn't just use her cell phone to call for help. But then the teen will figure it out. No big deal.
Same with mentions of music, movies, etc. Usually, not a big deal.
The issue really does effect longevity of the work when there is an essential character or plot element that is more than dated - maybe the thing you mention has changed over time, and it is so essential to the plot/character that it does interfere with the reader's ability to connect.
For example, say a book written at a time when Britney Spears was the height of cool. or Jessica Simpson. Or Michael Jackson. Menudo.
Now, reading a book now where Menudo was the MC's obsession and crush wouldn't maybe effect a contemporary teen from connecting - mainly because they don't know who Menudo is.
But what if the 16 yo girl MC has a major crush on Michael Jackson - would modern girl or boy readers relate to that?
What if the MC thinks Britnesy Spears or Jessica Simpson are the height of cool - a modern teen picking up that book might be immediately turned off, if they think Britney or Jessica are a joke.
The danger gets even more present if the thing you focus on or include is just becoming uncool. What if your characters love the Jonas Brothers. And the Jonas Brothers are cool now. But one month after the book comes out there is some big scandal and the Jonas Brothers are no longer cool at all - will a teen who picks the book up think you don't know what's what, or think your characters are lame or unreal, because of this immediately dated aspect.
Now, you could drive yourself crazy with this. I just think that is silly. Write a good enough book and it shouldn't matter. But it can, so it is necessary to ask why you are including something and if it is essential.
So...ask yourself whether the movie/music/technology are needed for the story. If they are, then you go with them and hope for longevity despite any datedness.
But if you are just sprinkling them for flavor, then don't - be stingy on adding anything that isn't needed for meaning/character/plot that could cause a reader to be turned off from the book.
~suki