While in his cell, Rama trains by hitting a sketch of a man on his cell wall. This is also exactly how Oh Dae-Su trained while imprisoned in Oldboy (2003).
When Bangun ask Eka to give peace package to Goto family, its contains the area of "Menteng" and "Sabang" and in reality, those area are the most expensive area with high profile residence (including Indonesian vice president's house, Jakarta's governor house and also most of the embassy residensial) in Jakarta.
When Eka first calls Rama when he's still in his suite, the name appears on his phone in all caps. However, when he calls Rama later on when he's catching up with him in his car, only the first letter of his name is capitalized.
Mad Dog is already dead, but the actor Yayan Ruhian will be back as a new character, an assasin named Prakoso. No, he's not Mad Dog's twin or something, he should be unrelated to Mad Dog.
Q
Will Mike Shinoda of Linkin Park do the score again?
A
No. While the first film has two score versions (the original Indonesian by Aria Prayogi and Fajar Yuskemal and the international release by Mike Shinoda and Joseph Trapanese), The Raid 2 will only have one version by Joseph Trapanese, Aria Prayogi, and Fajar Yuskemal.