Yes, there is a considerable difference between the sound we are fed on those two videos. But we do not have the slightest clue about the monitoring. It is possible that for the Queen video we are being fed a direct sound from the mixer (I suspect not); it's more likely that the position of the microphone(s) is much closer to the monitor speaker in the Queen piece. You can tell that it's an expensive, authorised, planned shoot and a proper sound crew would have been used who knew how to get the best sound out of the room....The video example of Queen - The Making of Bohemian Rhapsody shows an excellent acoustics in the room but in the Lady Gaga's producer reveals his secrets video we can hear echos in the room. Listen at 1.17 to 1.23. If RedOne is going to use the acoustics of the room to master Lady Gaga's tracks then I cannot expect the Cd to sound the same in my echoless and slightly dead room...ST
But what you hear on the Lady Gaga video is normal, what I would expect in even a fairly well damped studio. You'd be amazed how much sound bounces around, eventually reaching the mic. Do an experiment yourself. Do you have an MP3 player/phone with a record facility? Put it at the back of the room and play some pop music. On replay you'll be surprised how reverberant your room is. The human brain is very good at filtering echoes - the dumb microphone has no discrimination (except from angle of sound).