What interests me about your question is that it sounds like the clips are all on the same reel and shot at the same time. Am I correct in assuming this? Most DV cameras (and HDV) that shoot in 24p have a number of different ways they actually do this. Many of them add frames to your tape to make it 29.97 NTSC standards compliant. You need to remove the 3:2 pulldown. You can do this using compressor or some other plugin. Some cameras flag the duplicated frames (24p advanced) and FCP can remove them. I think it’s under tools -> remove advanced pulldown. Step through your clips frame at a time and see if you have a pause every 3 frames. If so… you know you need to remove the pulldown.