When the Ghostbusters first fire at one of the animators, Stantz says “Sorry Z.” Zeddemore then replies, “How about a little warning next time, fellas?” To me this makes no sense. First, none of the GBs even came close to hitting him with their streams. Second, you would think a veteran GB would have predicted that they would be firing at the ghost as it flew past them.

Anyone else notice this?

I think you're looking too much into what was an early release of the demo. Its possible the streams may come closer than they did in the early release when we see the final one, and its also entirely possible that if he was wrapped up in what was happening and thought he was taking care of the ghost on his own that he may need warning from others for help. In any case, its just an entertaining line that shows the camaraderie between the guys using a nickname and calling the others “fellas”.

JonXCTrack;136853
When the Ghostbusters first fire at one of the animators, Stantz says “Sorry Z.” Zeddemore then replies, “How about a little warning next time, fellas?” To me this makes no sense. First, none of the GBs even came close to hitting him with their streams. Second, you would think a veteran GB would have predicted that they would be firing at the ghost as it flew past them.

Anyone else notice this?

Umm to my understanding it went a little like this.

Ray was always the one that got off, shall I say, of the ghost busting business. Remember on several occasions he gets “over excited” as he says when they tried to catch the library ghost before. (H even has sexual dreams about ghost which is even weirder for him, but back to my point.)

Imagine Ray getting over excited about the ghost and accidentally trips over Winston in some way. Not really hitting him, but messing him up.

Winston just says “Hey, a little head's up next time things are about to go down.”

I best not tread on it too much, but that is my real explanation for it