Incorrectly regarded as goofs: During the "We're Back" montage, as Ecto-1 pulls out of the firehouse with Louis Tully running behind, there are clearly piles of wood and metal leaning against the back wall. During the rest of the movie and in the first Ghostbusters movie when Ecto-1 is parked in the main level of the firehouse, Janine's desk and Peter Venkman's office are at the back of the building. But, given that we know there was probably a space of time between the initial movie, where there was a huge hole punched in the floor, and this one, it's likely they had those materials to rebuild the firehouse and expand it.
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