Easter eggs
Assassin's Creed II has some few Easter Eggs, while the first Assassin's Creed had only one ( Transformers, the face of Optimus Prime in truck mode on walls) while many other games had Easter Eggs related to Assassin's Creed such as Metal Gear Solid 4, Grand Theft Auto IV and the 2008 version of Prince of Persia.
Mario
300px|left At the beginning of the third sequence, Ezio's Uncle says "It's-a-me! Mario!" which is a reference to Super Mario Bros. To further support this is Mario Auditore's Italian nationality, like Mario of Super Mario Bros.
Another reference to Nintendo's Mario is that both Mario's wear red, while the Mario's mercenaries wear green, much like Nintendo's Mario's brother, Luigi.
Giant Octopus
A giant octopus can be found in the Assassin's Tomb of Santa Maria Della Visitazione. The octopus appears before and after activating the lever that brings out the bars used to traverse the final chamber.
To find the giant octopus, you must look down into the water near the lever for a minute. Once a minute or so has passed, a cutscene plays, showing a large octopus swimming by. A second cutscene can be activated if the player pulls the lever and looks down again. The cutscene shows Ezio narrowly dodging the octopus's tentacle, before it swims away.
Altaïr's Outfit
left|300px Altaïr's outfit from Assassin's Creed can be unlocked via Uplay by purchasing it for 30 points. It does not add/change any stat points for Ezio. It can also be worn in conjunction with any cape, allowing the player to wear the Altaïr outfit and still maintain 0% notoriety with the Medici or Venetian Capes.
The Bonfire of the Vanities
After downloading The Bonfire of the Vanities DLC, you are briefly able to see a vision of your whole family. After you meet up with Niccolo Machiavelli, return to Palazzo Auditore and step into the center of the courtyard. Ezio will enter a mode similar to his Eagle Vision and be able to see the figures of his parents and all of his siblings around the palazzo. Once you leave, the vision will disapear and you will not be able to see it again. (The vision cannot be viewed if you have completed Bonfire of the Vanities, so make sure to do this beforehand.)
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Tools
Some NPC's tools can be used as Improper Weapons:
- Carnevale's violins
- Brooms
- Fishing Poles
- Rakes
- Pitchforks