Post/discuss any easter eggs from Naruto here. It can be from pretty much anything relating to Naruto (anime, manga, dubs, shippuuden, movies, ovas, games, or even cameo appearances from other shows).
Here's a few off the top of my head....
When Sakura's browsing through some stores she comes accross small (naruto themed) animal toys. I can't remember the episode, but I think it may have been in the Idate arc --- here's a screenshot:
In chapter 3, page 4 of the Naruto manga, there's a billboard with a picture of Masashi Kishimoto on it. I believe this is kept when the chapter is animated in the show -- possibly even recycled into other episodes too.
At one point when Naruto's leaving his house in the morning, he puts a key into the door on his house and we can see a small Pakkun key chain attached to it. If anyone wants to ellaborate on this one feel free.
In episode 59 (starting at 7 mins 8 seconds) of Yakitate!! Japan, Kawachi has a "reaction" to bent spring onions --- resulting in him fighting Suwabara dressed up as Ninjas, and mimicking a number of Naruto topics. Very funny -- they even did Dattebayo, the "my way of the ninja" line, and the Kage Bunshin no Jutsu. Best if you're familiar with the show, but It seems like it would still be funny if you aren't.