I answered this question earlier today by advising Deric to trim down the Keynote file he wanted to take a movie from and then go to Share > Export as Quicktime. This method will provide you with a compressed version of the video that you can then drag into iTunes or iMovie.
However, if you want the “pro” method then there’s a way to actually look inside a Keynote “package” and see the individual files it’s made of. In the previous version of Keynote you could control + click to “view package contents”, but now that option has vanished. Try this instead:
(1) Locate the Keynote file in the Finder
(2) add “.zip” to the end of the file name (click “use .zip” when asked)
(3) now double click the zip file and it’ll unpack a FOLDER
(4) inside the folder use QuickLook (tap your space bar) to check through the files
So, whether you’re working with your own Keynote file or someone else’s you can open up all of the assets that were used to construct it, and you can reuse them (within the boundaries of reason and rights, of course).

This is brilliant and worked perfectly. Thanks very much.
You are a genius! Thanks for this tip!!!
GREAT JOB! Do you have anymore idea about MACS? Send me the link SIR!
Thanks a MILLION!
I tried this with a Keynote file and it simply duplicated my file, BUT, I was able to right click and choose “Show Package Contents” with the new version.
Thanks for the tip!
awesome! so easy. brilliant!
you are a genius x 2
Thanks so much for posting this. I was going nuts trying to figure out how to do this. You made it so simple.
Thanks so much for posting this! Awesome tip!!
fantastic! good stuff. You are a genius!
Dude… Thank you! It worked like a charm and I GREATLY appreciate it.
Great Tip, worked perfectly! Thank you very much.
This was fantastic! Thanks for sharing.
Brilliant. thank you so much.
Many thanks from The Netherlands: works fantastic!
Thank you so much. This saved me a ton of work. Great post. Keep it coming!
Terrific! This was a great help. I needed to extract an imbedded video and had no clue how to do it. This worked perfectly.
Wow. I’m impressed how you came up with the zip method. You’re AWESOME. Thank you for saving me a lot of time!