Believe me, I have seen a lot in the several dozen projects that I've done. Wrong titles, wrong composers, missing composers, medleys that omit some of the songs played, misspelled names of musicians and composers, missing instruments and even incorrect musicians. One of the first major jobs I had was a compilation of previously issued material and both the date and the personnel were wrong on one track. I got into a debate with someone at the label and won the argument by citing the discography of the artist, a bio of him and the previous issue of the track. The drummer cited had been fired three months before the actual recording date.
Even odder was a compilation of an artist from his vast recordings for the label. When I got the advance, I pointed out that one of the songs didn't even feature a solo by the leader. I was asked for a suggested replacement and gave one, which was used. Then I mentioned one of this best known compositions recorded for them was oddly omitted, so they asked which song it should replace and they took my recommendation.
For some reason, certain labels and writers seem prone to these mistakes, though I won't mention any of them in a public forum.
Unfortunately, the quality of ASCAP and BMI databases have declined in recent years. Songs I used to find there are no longer present.
What's the deal with "Body and Soul"? I know Johnny Green wrote the music, but the lyric was evidently written by Edward Heyman, Frank Eyton and Robert Sour, though some listings omit one of the latter two. Was the lyric revised early on, or is this just a mistake that is repeated?