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While doing research, I keep on reading that this track seemingly features uncredited backing vocals from Freddie Mercury. When listening to it, I don't really think he's in there, but others think differently.
This wikipedia article references some sources claiming Freddie's contribution, but they don't actually provide any solid proof.
Queenzone member splicksplack seems to have reached out to Andrew Gold's producer five years ago:
splicksplack wrote:
Ok. First reply in. Brock Walsh was producer and vocalist on the album. Also a Queen fan. He has emphatically stated that the story is just that. A story.
Freddie did not sing on Never Let Her Slip Away.
That's from the producer himself.
However, he does not actually provide proof beyond this quote. Not to doubt his word, but we could use at least some screen capture or some other solid argument. Perhaps someone like Sebastian can provide a deep enough insight on this rumour?
My opinion is that this is some baseless rumor (I don't recognise Freddie's voice in this song, not in this particular version at least). But I don't really have much more than that to support my claim.