A couple observations
(1) Leggy is supposed to have already been an old-ish guy when last heard from over 10 years before, but his "mum" looks about 35! (Well, I guess this isn't the sort of film where realism is a big consideration.)
(2) I'm highly familiar with the Rutles' (real) albums, but haven't seen this film much. Anyway, I never realized (until seeing this last night) that it was Rikki (Stig) singing "Between Us." I have a hard time telling him & Neil (Nasty) apart. I'm still not positive which one sings "Joe Public."