LexX sorry I have not added the married with children entry but I am not sure I understand completely. Are we talking about scenes possibly deleted from National Lampoons vacation?
The early seasons start with showing Chicago highways and you can spot the family wagon there. The scene(s) ARE from Vacation, but I’m not sure if all of them are or if the one where you can see their car is an unused shot from the movie or an actual shot from the movie. You’d need to watch them side by side… But not sure about the other Chicago scenes, there are more highway shots in the show and for example both feature the fountain but is the one from the show actually from the Vacation shoot, not sure…