Yep, I completed the game then hung around until the credits had finished, you then get thrown in to a hostage situation on a plane where you have to resuce a hostage in under 3mins I think, then find your way out quickly, as a bomb gets planted, its pretty cool. You get cheat and arcade mode as an unlock.
the last mission is small enough and easily doable in this time, didnt think it was an easter egg – its more…just part of the game, but cheats r good fun to muyck around with .