Not sure if anyone can help, but I had issues with the uncut footage for 2 episodes in season 6 - S06 Ep 13 - The One With Rachel’s Sister and S06 Ep 21 - The One Where Ross Meets Elizabeth’s Dad.

My Uncut versions were in the PAL format but for some reason those two episodes ran at the NTSC speed.
Due to the PAL settings but the wrong speed they encoded differently to the rest, for the uncut segments.

If anyone has the actual NTSC version for them and would be willing to share, I could attempt fixing them.