I'd not noticed that one, but costume errors do happen, sometimes on small levels, sometimes on big ones (one I recall from Ghostbusters was the black square was missing from the inside of the elbow pad in some scenes, one from Ghostbusters II is that when Winston breaks down the door to save Egon and Ray from the Vigo-started fire, his uniform is missing the logo patch from the arm.
Another continuity error I spotted is when Wrecto-1 is driving to the mine/temple to confront Gozer, there's a moment when the emergency lights are seen inactive, but the shots bookending this shot did have the lights going.
What likely happened is the production used some footage from the Muncher chase and inserted it into a later moment in the film. There are a couple of other moments where Wrecto's lights are off when it's arrived at Egon's farm... But we've been having continuity issues with the car's lights going back to the first two movies.
Some people have tried to put this down as not continuity errors but the movie showing ectos wiring is faulty....kinda reaching there to say the least.
When Phoebe firsts finds Egon's flight suit, you can see what i think is a slinky on the left side of the screen
The camera then shows her reaction then cuts back to the suit showing her to take out a crunch bar wrapper. The slinky (or whatever is is) is gone:
After another shot of Phoebe, we see the suit a third time as she's taking out Egon's glasses and the slinky is back again
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