I’m not sure if this counts as it might not be in the film, but on Holtzman’s pack on the poster it says 2206, which was Dana Barrett’s apartment number.
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Kevin’s message on the answering machine is “Ghostbusters, whadda you want?”
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There’s either a pub or an off license on the side of the Mercado for some reason, tagline something like “Serving Irish beer since 1984”
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And of course, Rowan stomping down the street recreates this classic scene:
…and yes, that means your childhood got shot in the crotch. 