I don’t believer your can find any of the screen used vehicles or props in the park now. They removed Benny the cab, the last one, a few years ago.
There is a Maroon Cartoon billboard facing Echo Lake, and Eddie Valient’s detective agency is written on a window above Hollywood and Dine, with a Roger Rabbit shaped cut out in the window blinds. Those may be the last remnants of the property in the park?