To start off, I found these totally by accident. I've never found a single easter egg on my own in my entire life. In the Target two-pack? I found five.
In case these work on all dvds, here they are (these are all in the bonus disc, I haven't looked at the movie yet):
1) Go to Our World: Go all the way down until Battleground is selected. Hit the "Down" or "Left" arrow once more and you'll see a symbol to the left of Main Menu. Hit "Enter" and you'll see a blurb about the "Bay Bot"
2) Go to Their War: Go all the way down to Inside the Allspark is selected. Hit "Left" and you'll see a symbol next to Main Menu. Hit "Enter" and you'll see Micheal Bay getting torn out of a mercedes, and Shia LeBouf cackling about how great that is.
3) Go to More Than Meets the Eye: Start with Main Menu selected, then keep going up once past From Script to Sand: The Scorpinok Desert Attack. A symbol will appear next to Main Menu. Hit "Enter" and you'll see Mojo's casting call.
4) On the Main Menu: Go down until Set Up is selected. Hit "Left" and the Decepticon symbol will appear to the left of Set Up. Hit "Enter" and you'll see the DVD credits. Now I know why the Decepticon symbol's so appropriate.
5) Go to More Than Meets the Eye then the Trailer section: Go down to Theatrical Trailer 4 is selected. Hit "Right" and a symbol will appear to the left of More Than Meets the Eye. Hit "Enter" and you'll see a deleted scene where the X-Bot was going to rip off a girl's dress.
ps: if anybody's found any more easter eggs, please tell me <3