Question: In this episode after Dean comes back from hell, he and Bobby go see Sam at the hotel. There is a woman with him who says her name is Kristy. It is the girl who's body Ruby later uses. Is this actually Ruby, or the real Kristy?

Supernatural (2005)
1 question in season 4
And Then There Were None - S6-E16
Revealing mistake: Samuel is very much dead, laid out on the table in the canning factory employee lounge, but as Sam stands over him, talking about whether or not it was right to gank him, you can see Samuel's chest rising and falling as he breathes. (00:26:30)
Dean Winchester: Come on man. I know Sam, ok? Better than anyone. He's got more of a conscience than I do. I mean the guy feels guilty searching the internet for porn.
More trivia for Supernatural
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Chosen answer: In a later episode, it shows a flashback, revealing that "Krissy" was actually Ruby the whole time. She has possessed the girl beforehand. I think when ruby saw Dean, she started to improvise, which is why Sam was so surprised when the girl told him he got her name wrong. It's because it was really Ruby, and Sam was well aware of that.