In one shot of the episode Bloody Mary, about 14 minutes into the episode, you can see a "Visitor" from previous episodes to the right side of Randy, when he is talking to Stan. The alien is only visible for around seven seconds. See more...
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Updates: 
Series 7
Continuity: In the scene where the Cartman family and boys are seated at table, Kenny sits between Kyle and Great-Grandma. But a few shots later Kyle has to hold Great-Grandma's catheter bag, as he is now sitting next to her, and Kenny is no longer between them. However he's back between them again when the camera shows the whole table.
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