In the music store, Lionel makes a reference to the word "vest." He explained that in American English it means the same as what British people call a "waistcoat." The reason the word is funny to the British audience is because in British English "vest" means what Americans would call a tank top.
Lionel mentions that he is cash poor in Britain because the Kenyan government had "moved the goalposts" and that he could no longer spend profits from his plantation outside of Kenya. He is referring to laws in the African nation relating to land ownership and foreign investment.
"Dodgems" is what Americans call "bumper cars."
Jean says she is able to smirk and wink about sexy questions because she is actually thinking of "gooseberry fool," a sweet, yoghurt-based dessert.