I reckon I could accept the clerk getting the day wrong if they were being asked to remember back a long time, because let's face it, who can remember what day something happened 6 months ago. But VK and JM were talking about the rumour on the Monday after DeOrr disappeared. So the sighting came to others' attention sometime between friday and monday. I would have though the clerk would find it hard to get a date wrong when asked only a day or two or three later. Additionally, if it was the Thursday night, then wouldn't VK and JM have said "yes that was us but the night before". They didn't they tried to claim it was early on Friday.