Stay Puft
The Stay Puft gallery covers the Stay Puft Marshmallow Man, from the construction of the giant's interior skeleton and face to photographs of the performer wearing the costume on set. Bill Bryan suited up to play the Marshmallow Man for the scenes of the giant walking through New York City.1 The photos range from in-progress shop work on the head and frame to the finished suit on the street.

Bill Bryan suiting up for Stay Puft Scene.

Stay Puft on street.
Terror Dogs
The Terror Dog gallery documents the two demonic hounds, Vinz Clortho and Zuul, in their various physical forms. The images run from small-scale miniatures used for distant or full-body shots up to full-scale animatronic dogs for closer work. One photo shows Sigourney Weaver, who played Dana Barrett, seated in a chair with the Terror Dogs.2 Another set captures the sculpting of a Terror Dog before the larger version was built.3

Sculpting the Terror Dog, before larger version.

Sigourney Weaver on chair with Terror Dogs.
Onion Head (Slimer)
The Onion Head (Slimer) gallery collects production photos of the green ghost, Slimer, who was nicknamed "Onion Head" during production. The images show how the puppet and its mechanics were assembled for the film.
Library Ghost
The Library Ghost gallery covers the apparition from the New York Public Library sequence that opens the film, including the making of the character. The role was performed by Ruth Oliver.4
Behind the effects
The 1984 film's creature and optical effects were produced through a combination of shop-built puppets, full-size suits, miniatures, and motion-controlled animatronics. The galleries on this page focus on that hands-on craft: the molds, armatures, and mechanisms that brought the ghosts to the screen before being composited into the finished shots. For the design work that preceded the builds, see the related Production Sketches.
References
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Source caption, GBFans.com Special Effects Photos: "Bill Bryan Suiting up for Stay Puft Scene."
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Source caption, GBFans.com Special Effects Photos: "Sigourney Weaver on chair with Terror dogs."
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Source caption, GBFans.com Special Effects Photos: "Sculpting the Terror Dog, before larger version."
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Source text, GBFans.com Library Ghost Special Effects Photos, identifying Ruth Oliver as the Library Ghost.