This easter egg can be seen in Season 7, Episode 24 titled, "Murder On The Planet Express".
After the scene where everyone at the conference table shows their security camera recordings there is a quick transition scene that shows the outside of the Planet Express building before the professor tells the team they’re going on a team building trip.
During the transition scene a truck drives by with a number of arcade game cabinets on the back. One of them is the game cabinet for Wreck-It-Ralph, a Disney character from a movie of the same name.
This easter egg is a tribute to the director of Futurama’s pilot episode and Wreck-It-Ralph’s director, Rich Moore.