Besides "A New Leaf," Walter Matthau appeared in one other movie in 1971 known as Kotch

http://www.imdb.com/title/tt0067314/

SteveA, you should take some interest in this movie too, because there's a scene where Matthau rides an MCI MC-6;
http://www.toybusexpo.com/tin-bus/77_0_12_0_C/

http://www.busexplorer.com/PHP/MidPage.php?id=378


I'm afraid I don't have any pictures from the movie though, because my PC is in the shop. This also means I'm going to have to delay this and my attempt to capture screengrabs of vehicles in Recipe for Disaster(2003)(TV Movie), which I originally was planning to gather this month.

Anyway, here's the kind of bus I'm talking about.