There is an Easter egg where you trigger an event of a Megalodon Shark appearing out the water for a couple of seconds on the multiplayer map 'Paracel Storm'. But the Easter egg is only available in Community Test Enviroment servers and not released on the original version of the game.
The campaign takes place in the year 2020.
On all multiplayer maps, there is an event called the "levelution". This, given by the name, fully destroys a key part of the map.
Recker the main protagonist do not speak at all, however there are point and click actions (quick time events) which acts as Recker's response.