The first egg can be accessed by entering the "Special Features" menu. (Upon doing so, you'll be given a choice of three locations. Click on "Central Park".) Highlight "Documentaries" and press left. A halo will appear on top of Nicky's head. Press enter to see the teaser trailer for the "Lord of the Rings" trilogy.
The second egg can only be accessed by first accessing the Easter Egg noted above. After watching the "Rings" teaser, you'll be brought back to the "Special Features" menu. Make Nicky's halo appear again by highlighting "Documentaries" and pressing left. From there, press (in order) the left, down, and right arrows. When done correctly, the feature will automatically play in Infinifilm mode. (According to New Line, the Infinifilm presentation of "Little Nicky" was done as a demo to test the pop-up menus that appear during the feature.)
As with many New Line titles, the DVD credits for this disc can be accessed by clicking on the New Line logo on the main menu.
Reviews: DVD Talk also has a review of
Little Nicky: Platinum Series by Aaron Beierle.