Other mistake: When Buster Moon is calling out the solo acts for final selection he calls Daniel's name with no megaphone and Daniel can hear his name fine. Then when Buster is making the selecting the solo finalists, Daniel cannot hear him, requiring Buster to use a megaphone to talk to him.
Other mistake: Considering how famous Nana Noodleman is it's odd that everyone is surprised that she's still alive.
Other mistake: When Mike finishes his song and the audience begins applauding him, you can see the microphone cord dangling from somewhere above the sets, despite it previously having its stand on the stage. This is obvious when he's swinging from it. What is it hanging from, thin air? There was nothing he could attach it to while swinging; the cord should've snapped rather than holding.
Answer: It would have to do with paying royalties to the artists if the songs were included on the soundtrack album. The artists would be paid a one-time flat fee for their songs to be used in the movies or the trailers, but for albums being sold would mean some of the profits would have go to the artists. The movie studio can make just as much on the soundtrack album without certain songs being included. Regarding the title, it may be the artist wanted it changed for some reason, or the filmmakers felt it didn't fit in.
raywest ★