When Peter continues his voice over with "Naturally we agreed it was nobody's fault", two Ghostbusters, both wearing Ray's uniform are seen jumping over/running past a barricade with the No Ghost Logo.
The Spectral Ghostbusters steal Ecto-1 and drive it out of the firehouse, leaving it to the right of the entrance. When the real Ghostbusters run out to the car later, it is parked in front of the doors instead.
When Peter fires the last remaining proton pack at the spectral Ghostbusters, he disappears for few frames.
After Winston asks him if Slimer tricked the Spectral Ghostbusters into wasting enough of their energy, Egon replies "I don't know, but I think we're about to find out!" However, we see Spectral Egon saying the words instead of regular Egon.