I could use before/after frames from laser or DVD, just any source where I'm sure I'm getting the exact frames. They may be the same as the CED frames in the previous link (well, technically the CED frames are the beginning and end of the new bit, so they're one frame off, but it's still the same point), but again I just want to be extra sure before I do any cutting.

I don't believe Dentist on the Job was originally theatrical, although it may have been added to the 2001 theatrical run with the revised print/surround audio, so it's theatrical in that sense. Either way it's beyond my capabilities to mix different sources at different resolutions and have it come out looking halfway decent, so no I'm not doing it. I'm not Harmy ;)