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: It's not any specific bar, it's just a very common trope in this kind of movie to show everyday people in a bar/pub watching/responding to a massive televised event (cf. V for Vendetta). The guy sitting next to Bob Geldof is David Hepworth, who's not super famous; he's a British music journalist and was a co-presenter of Live Aid.