in the lady and the tramp, the movie is clearly in new york in the 1970's or 80's, they dance on top of cars, and there are modern style stores. however, in the Lady and the tramp 2, the movie takes place in the 1920's. Model T fords. Old stores, and clothing. No question scamp is his son, so time is supposed to go FORWARD.

Then, later in the movie when he (scamp) wants to be accepted by the junkyard dogs, in the junkyard there are modern cars broken down, and car parts