Revealing mistake: When Carol Anne has been hypnotized by the shrink, a hand breaks through the desk and throws a coffee mug through the mirror. You can briefly see the reflection of the plexi-glass protecting the actors behind the mirror as the mirror breaks.

Poltergeist III (1988)
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Directed by: Gary Sherman
Starring: Tom Skerritt, Nancy Allen, Lara Flynn Boyle, Zelda Rubinstein, Heather O'Rourke
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Kane: Tangina.
More trivia for Poltergeist III
Question: Whatever happened to Scott, Donna's boyfriend? Donna and everybody else returned after Tangina left with Kane, but did he?
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Answer: At the end of the movie, it was a different actress who played Carol Ann as the actress had already died by that point. Rumor has it that the actor who played Scott was so distraught over her death that he couldn't come back to film the scene.
lartaker1975