Below are two interesting Easter Eggs for Assassin's Creed 2.

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Broom Hammer
If you come across a man who is sweeping the street, knock him over or throw him so he drops his broom. you are able to then pick up the broom with "B" and use it as a weapon. It's attacks are that of a blunt weapon and you can also do this with farmer's garden hoes.

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Mario Quote
When you are escorting Maria and Claudia to the villa, you will eventually be ambushed by Pazzi and his men. You are rescued by your Uncle Mario, and when you first talk to him he says "Don't you recognize me? Its-a me, Mario!"