Just recently a Chocobo glitch was found that allows speedrunners to skip Kalm flashback sequence: https://www.youtube.com/watch?v=XiO9ixPicHU . There's also the materia smuggle glitch found not too long ago: https://www.youtube.com/watch?v=hosDrlVF6e4

I recommend this whole channel as it's a great resource for FF7 in general and covers the newest developments: https://www.youtube.com/playlist?list=PLyotyCGt7oYAKM1mCwsHT...