There is a brief vintage scene of Egon and Janine Melnitz where she gives him her lucky coin from the 1964 World's Fair at Flushing Meadow. This is actually a deleted scene from the original film.
It cuts from Janine handing Egon her lucky coin to her, in the present, looking at it. She’s in the office building of Winston Zeddemore, who has transformed himself in his post-ghostbusting years into a billionaire businessman. The man who began as the blue-collar Ghostbuster is now a one-percenter. Winston explains to Janine that his time with the Ghostbusters convinced him he had the tools and the talent to better himself. Not only did Winston pay many of Egon’s bills but he also didn’t turn the old firehouse headquarters into a Starbucks as Ray said it was. Winston says no matter what he’s achieved since he will always be a Ghostbuster.
We then see Winston arrive at the old Ghostbusters headquarters as the Ecfo-1 finally comes home. (Winston said during the third act that he would take care of the battered, old vehicle.) Winston runs his hand down the car and then walks further into the dilapidated building. The final shot of the movie reveals the Containment Unit in the basement of the firehouse blinking red, an ominous sign that all the psycho-kinetic energy held within it is ready to burst out