If the sample’s been cropped in Vegas, it’s not a sample of the untouched file. What format is the original in? We’ll need a sample of that. If the episodes aren’t too big, just upload one and PM me the link.

TheStarSwitcher said:
-My initial source for these is in 25p.
-The files I have are in 30p, resulting in a duplicate frame.

…Is there any way to get rid of the duplicate frame, going back to 25p…?

I don’t understand this. Whatever you did that changed the frame-rate was the wrong thing to do if you’re now asking how to to undo it. Don’t handle your initial source in that way: find some other way.

…and possibly restoring some lost motion by interpolating that to 60p?

Motion interpolation won’t restore lost temporal resolution. You’ll probably find the result smoother in terms of motion, and the interpolated frames might resemble the lost ones superficially, but there’s no getting them back. What’s gone is gone for good unless you find another source that’s not been (mis)handled in the same way.