Dawn Of The Dead - The Ultimate Edition (1978) has 6 easter eggs:
Disc 1 - U.S. Theatrical version
From the main menu go to Audio Setup, then at that menu arrow up, and the zombie silhouette will highlight. This will take you to an interview with makeup effects artist Tom Savini, talking about a practical joke he once pulled.
Disc 1 - U.S. Theatrical version
From the Main Menu, go to Extras menu, and from there arrow up to highlight the zombie. This takes you to an interview with Chris Romero about how she met her husband, George A. Romero.
Disc 2 - Extended Version
From the Main Menu, go to Extras, then choose Commentaries. From that menu arrow left to highlight the zombie and this takes you to an interview with effects artist Greg Nicotero.
Disc 2 - Extended Version
From the Main Menu, go to Extras, then choose Still Galleries. Highlight Main Menu, and right arrow to highlight a zombie silhouette. Press enter to see an interview with Gaylen Ross about an incident on the set.
Disc 3 - European Version
From the Main Menu, go to Extras, then choose Trailers. Then highlight Main Menu and left arrow to highlight a zombie silhouette. Press enter to watch an interview with the man who played the "Screwdriver Zombie".
Disc 4 - Documentaries
From the Main Menu, left arrow to highlight a zombie and press enter to watch a video of a buddhist who talks about Dawn of the Dead.