Continuity mistake: Mini-me spits on Austin during their fight on the moon. We never see him clean it off, but it's missing from his face seconds later.
Continuity mistake: When Mini Me is first ejected into space, you see him just flying backwards, yet in the next shot he is rotating freely.
Continuity mistake: In the lab scene (with the coffee gag) Basil looks much younger than he does in the 90s. However, earlier when Basil asked Felicity to plant the homing device on Fat Bastard, he looked the same as he did in the 90s. He should have looked younger both times.
Continuity mistake: During the first scene of the movie with the robot android, when Austin's been blown up by the explosion, his glasses change from broken to perfect between shots.
Continuity mistake: When Austin is fighting with Mustafa at the side of the road, we see a red London telephone box. But if you look inside, you can spot a modern day push button phone, which weren't in phone boxes in the 60s.
Answer: The music is the theme song to the TV show "Charlie's Angels".