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Chariset
Since: Jan, 2001

Characters have entered an Alternate Reality that resembles their own, but differs in some way not immediately apparent. Just as they start to get comfortable and think they're home, one or more of them discovers something doesn't match — the Golden Gate Bridge is the wrong color, say (Sliders) — and they realize it's only a close parallel to their world of origin. There are trope names for the world and the resulting dilemma, but is there a name for the actual feature (landmark, person, historical fact, etc) that clues them to the situation?