Hello LCGalletti,
And welcome to Apple Discussions!
Are you receiving any error messages while trying to sync these movies? How do you have your iPod configured to sync movies from under the
Movies tab? Do you manually manage your iPod's contents?
Perhaps these videos are just not compatible. If that is the case, highlight the video in iTunes and choose "Create iPod or iPhone version" from the
Advanced drop down menu. Then try resyncing these movies to your iPod.
If they are purchases from the iTunes store, make sure you are trying to sync the *Standard Version* and not the *High Definition* version.
For more help regarding this issue, see this Apple support document.
http://support.apple.com/kb/ts1497
B-rock