Found an interesting video on you tube. QUEEN- DEMOS, REMIXES AND UNRELEASED TRACKS (FULL ALBUM)
Alternative mix/version of The Invisible Man starts at 35:50
Most notable difference is of course the boogy/Elvis-like bridge on 37:30
Do you prefer the track with this on it? I actually do. It gives some breathing space.
(Altogether the mixing on this one is more "open" and like a blend of the original and the 12" version.
Also like the flange/wow effect on guitar on 36:46. Sounds modern)
There are like two demos of The invisible man. One sang by Freddie, including the Elvis style in the middle, the other sang by Roger with also the Elvis style Freddie's vocal. This last was official released in The Miracle Deluxe Edition 2011.
To my father, deleted bridge version.
To my, original version.
The demo sang by Freddie is from a demos cassette presented to the label, containing a demos medley.
And the demo sang by Roger, like Ignacio Reyo says, is from The Miracle Deluxe Edition released in 2011.