Ghostbusters Italia have posted two interviews with Robin Shelby, who was the actor inside the Slimer suit in Ghostbusters 2, and Jim Fye, who acted as Tony Scoleri, the Statue of Liberty, and the ghost jogger in Ghostbusters 2. Short, but great interviews, you should definitely check them out!
[UPDATE]
Paul at Spook Central points out Robin revealed a new scene cut from the movie, wherein Slimer, after driving the bus Louis is on, joins him afterwards. For anybody that thinks there was too much Slimer in the movie, to make it kid friendly, boggle at how much more they prepared to possibly include before commonsense stepped in.
The best memory during the filming of GB2?
Shooting a scene where Slimer gets off the bus to join Louis. The energy we all had during and after shooting that scene was unbelieveable. This didn’t end up in the film, but as we wrapped that day we knew we had all accomplished something pretty remarkable.
Not logged in 
Curious… I’ve never seen that scripted anywhere either? The only “deleted” Slimer scene I was aware of was him flying around Libby at the end of the film. Wonder if it was just impromptu ILM or 2nd Unit coverage?
That scene was talked before – Slimer pats Louis on the shoulder and kisses/licks him. It was all done in cut.
We all knew that there were LOTS of deleted Louis/Slimer scenes, but this was the first time I ever heard of a scene where Slimer got off the bus and joined Louis – hopefully not in the acting of being a “ghostbuster”. Having Louis pretend to be Ghostbuster was bad enough
PS: Thanks for the mention. I read the interview and I had to do a double take after reading that response from Robin. To make sure that little tidbit didn’t get “lost”, I used it as a teaser to promote the GB Italia interview on Twitter. Information retained, interview promoted – two birds, one stone
Slimer and Louis became friends in this scene. It was described that Slimer turns from sad to happy (as seen in one of the rehearsal videos).