This is a video of Prince doing a benefit at a Minneapolis club, performing a version of Purple Rain that would go on, after editing, to become the album version of the song.

As you watch the video, check the comments/subtitles to watch for where the album version edits occur. Fascinating to watch this source material of such an important (to me at least) work.

Check this link and this link for some more detail on that 1983 benefit.