Re: Cheers Season 9 already released
Having finished the set, I'm happy to say I noticed no additional music substitutions beyond those in Grease. Though, I believe that episode was the only one to use licensed music recordings, as other music uses in the season (e.g., karaoke, Unchained Melody, an Elvis impersonator, etc.) were performed by the actors rather than using the original recordings. So, 0% (0/1) of the pre-recorded music was retained, but Paramount is batting 1,000 for songs performed by the actors.
It's hard to say if any episodes ran short, as episode lengths tend to jump around a bit. Veggie Boyd and Wedding Bell Blues both ran over a minute shorter than the standard length though, so maybe someone who actually saw the episodes pre-syndication could check them out to make sure all originally aired content is included. I have no way to know for sure, since I never saw the original airings, but I noticed no cuts.