The whole thing lives in one fixed phrase: (누가) X 아니랄까 봐, literally "in case anyone should say they're not X," used to tease someone for behaving exactly like the thing they are. [누가 P들 아니랄까 봐] is "typical P-types," 영국사람들 아니랄까봐 is "Brits, of course," [재담꾼 아니랄까 봐...] is "true to form for a born entertainer." Every line here has that 아니랄까 봐 shape, most of them as on-screen captions teasing a cast member. It is affectionate rather than cutting.