Factual error: The drumkit Roger is using with Smile is a Sonor Hilite which was manufactured in the late 80s.
Continuity mistake: When Freddie gives the ring to Mary, his right hand is either below the ring case or holding the front part, depending on the shot.
Continuity mistake: When the movie begins and Freddie is launching suitcases, the colour and type of the bags is not continuous between the first shot and the immediate wide angle.
Continuity mistake: While the band talks with John Reid for first time, the sun changes between shots.
Answer: The answer is that during Live Aid, the soundboard engineers had a set volume to work to. The story goes that the soundboard engineer for LA also worked for Queen and set the volume louder for their set only, to make sure they came across louder and therefore better for the audience. That's one of the reasons that Queen's set is regarded as the best on the day.
Wezza