two examples that immediately come to mind are 1) a few weeks ago, after vasudev got that beating in the presence of jarasandh, and keshani stops by their cell to apologize. devaki goes from embittered and sarcastic "wah bhabhi, wah" to suddenly hugging her? 2) when the very slow bird bakasur is on his way to gokul, vasudev goes from "our baby scares kans, he's God, we have nothing to worry about" to breaking down and begging the guards for help just as quickly. generally speaking, they both act differently everytime they are shown - sometimes hopeful, sometimes pessimistic, sometimes comforting each other, sometimes making each other feel worse, etc. the worst was in a recent episode, when devaki's talking about being free one day and visiting their son, and vasudev breaks out an evil laugh and tears her hopes apart. that was wierd. old vasudev was the opposite, always comforting and supportive, and the exact daydream/darshan scene that they remade (anyone remember, right before the soja lalla song? if not check it out on dailymotion) originally included him encouraging her, not admonishing her.
this was one major aspect of the original serial that i really loved because the way it portrayed these two was really inspiring. their every dialogue, scene, and song was about "dheeraj" and "vishwaas" (http://www.youtube.com/watch?v=d-BzZFlVI9Y). after finding out about krishna being alive, they are totally blissful and never mope around again (http://www.youtube.com/watch?v=l-yH1g4iGiE). they give each other hope not take it away from one another. imo, there was much to be learned about devotion from the way these characters were portrayed in the original, and i hope the new writers realize and correct this one big blunder in an otherwise very good show.