Ray and Egon were over-enthused and blinded by that enthusiasm. Winston really should have tried harder to get them to listen to reason.
Of course, having the packs might not have saved them from falling into the River of Slime. But on the other hand, if they’d been armed when the River made them pissed off, that would have been…bad.
Also they went down in the tunnels armed with pickaxes and shovels. They were anticipating having to do some heavy lifting to break from one tunnel to another. Carrying 100 lbs of proton pack on a digging expedition probably didn’t seem practical to them (until they got the sh** scared out of them).
Well considering that the packs are heavy (supposed to be around 100 lbs) The characters probably wouldnt want to be climbing around underground with them on if they didnt need too.
I always figured them not having the packs was a way for the writers to not have to write in the packs getting damaged when they fell into the slime. Some fans have speculated the Egon has made spare packs, but this is never really hit on in any of the films.
saw the other day in the end credits as the guys jog through the taxis in the road, I think on the “don’t know where the cards may fall” you can see a woman in the background that is looking at the camera and waving like an attention whore…
not too sure on this one but as the guys attempt to get Dana out of the hoses…sounds like Winston says “GOD” and then Ray says “DAMN” 
This is one that’s not really hard to miss when Peter goes to see Dana at the museum there is a shot of Dana entering the museum…
When the guys go to visit Danna and check out the baby the first time. Danna is practicing and her nanny is feeding the baby when they knock on the door. Danna says she will get the door. After that, the nanny disappears. She is never seen in the background or helping with the baby or ever again in any other scenes. She is not seen leaving, or Danna telling her bye or anything. Accepting that she is not a live in nanny and goes home at night, why was she not helping when Danna moves to Peter’s apt, or asked if she could babysit when they go on their date?
Also funny how everyone says they never noticed Winston was in the courtroom, yet the opening courtroom scene, Winston is leaned over the table saying “Wow what a guy” and Egon says “Yeah they call him the hammer”
And ALSO… Why was Winston not helping them dig the hole in the street?
Because no one cares about Winston.
…you ever noticed that her name is actually ‘Dana’?
At that time Winston was in Africa with some chick trying to find Bruce Campbell. I’m a litte foggy on the rest of the details. STOP EATING MY SESAME CAKE!!!
because Winston doesnt dig holes. He stares at the ground until it breaks and opens up.
Exactly.
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I always thought they must have spare packs, Louis seems to find one no problem when he goes to “help out” at the museum!
Edit: Dammit, I just realised that they only took 2 with them. 2 packs and 2 slimeblowers. Your point still stands good sir, my apologies!
When Dana goes to get the baby back from the museum she has on Venkman’s shirt & coat.
They had all four packs when the failed at blasting the museum. I doubt they went back to the Firehouse before going to Liberty Island so, yeah extra packs it is.
All four guys are able to fit through the window slots of the Statue of Liberty’s crown (with packs and slime blowers on) when they descend into the museum.
I dunno if others have reached this conlusion before or if I’m reading to much into it…
In Ghostbusters, Janine was into Egon and was quite flirtatious with him. In Ghostbusters 2 she moved onto another geeky charachter (Louis Tulley)…Has anybody else noticed the fact when Louis is wearing a Ghostbusters uniform…Janine has picked out Egon’s uniform for him!
Perhaps she was fantasising about Egon still!
Poor Louis
Of course she was. Who could resist Egons epididymis 
James Van Hise, JMS, and legions of fans combined that with the fact that Egon and Janine don’t actually appear on screen together in GB2 as a loophole when they all went “Eeew” to the whole Janine/Louis mess. Even when Louis was available in RGB after GB2, there were only a few attempts to follow up that part of GB2, and they were half-hearted at best. Note that “Janine You’ve Changed” came out over a year after GB2.
So…yeah. Who could blame her for liking Egon better?
I was watching GB 2 tonight on my laptop with headphones in and never realized that after Venkman says “The old ‘man-eating toaster trick’” when they all attack him, Egon yells “You’re getting a lobotomy!” I thought that was hilarious.