Two frame rates within an HD movie - 24 & 29.97

I recently imported a finished audio track for an HD movie into a Final Cut 5.0 project and it drifted all over the place. I discovered that I have clips in my FCP session that are both 24fps and 29.97fps. The editing timebase is 24fps and the audio print master is 24fps. Movie was shot by two different crews at different times so source material mistakenly has two different frame rates.
-Is this resolvable? Can you do a pulldown for clips only and not a sequence?

Thank you most kindly Russ,
Increase rather than decrease.  That's what was lingering in my memory.
Yes.  Better to be conscious of the frame rate of the camera at all times.
But I often 'post' other people's films, and not everybody is so aware of their frame rate settings.
Very much appreciated.  I can now coach my friend with some degree of confidence.
B

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