The spoof of "I'm right behind you." "No, I'm behind you." In the anime, they keep appearing behind each other - not attacking, just Flash Stepping behind each other - for a good ten seconds. And it is hilarious. Tokiko's reaction just makes it better.
Even better, they end up Flash Steppingright out of the room and outside.
The moment while Kazuki and Tokiko share their second kiss, and Mahiro pops up with a squee on her face.
When infiltrating LXE's headquarters, Kazuki, Tokiko and Bravo strike poses (which are also Shout Outs to other famous anime poses) at the door when prompted in order to get in. When nothing happens, Bravo muses that, since they're obviously enemies, they probably wouldn't be let even if they knew the password, and an embarrassed Tokiko angrily breaks down the door.