video games: what's the first video game ever to contain an "easter egg"?

Questions

n boy meets world,what is the crazy older brother's name??

ON Beverly Hills 90210,where did the Walshes live before they moved to Beverly Hills??

What was the name of the magazine on Suddenly Susan??

On Full House Uncle Jesse had a last name before it became Katsopolis what was it??

On Beverly Hills 90210 What was the name of Brandon's first car??