Chinen's speciality that Matsujun doesn't have 

First time subbing. Only sub the part I really understand (maybe).
00:34 Matsujun is making fun of Chinen's born year (Heisei Era is 1989-present). Matsujun was born in Showa Era (1926-1989). This 'Heisei born' joke, i think, is often directed to the JUMP members because their group name refers to Heisei Era.
01:48 In Arashi, only Sakurai and Matsujun can't do a back flip, claiming that "it's not because we can't, but we just won't do that." The only 'members' I know besides them are Sexy Zone members (except Matsushima)