 The animators were told to make a detailed replica of the city . David Silverman was sent to Manhattan to take hundreds of pictures of the city and areas around the World Trade Center . When he returned , Lance Wilder and his team spent time creating new scenes and backgrounds , incorporating small details such as signs and hundreds of extras that would correctly illustrate the city . Oakley and Weinstein were pleased with the final results , and both noted that the buildings , streets , and even elevator cabins were detailed closely to their real life counterparts . In the final scene , as the family is seen driving away from New York on the George Washington Bridge , the credits roll with the " camera " gradually pulling back from a view of the car , to a view of the side , and then on to a panorama view of the city ; as if the whole sequence was being shot from a helicopter . To achieve this effect , a computer model of the bridge pulling out was made and then printed out . With the print outs , photocopies were made traced onto the animation cels . The process took a long time and was expensive , as the use of computer animation was not widespread when the episode was produced . Director Jim Reardon wanted to replicate films that ended in a similar way , and commented , " I remembered that every movie located in New York would pull back if you were leaving town on a bridge . " Shortly before the episode aired , the production staff contacted Fox to make sure they would not run commercials during the credits . 
