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This explains exactly how he got her room number (in at least one of the instances):
http://pagesix.com/2016/02/29/erin-andrews-stalker-revealed-his-creepy-peephole-techniques/
"While waiting for his room, Barrett said he went to the hotel restaurant, where he found a house phone that displays room numbers and called the operator.
“Can I have Erin Andrews’ room?” he recalled asking.
“They connected me,” Barrett continued. “On the house phone it shows a room number, so I knew what room she was in.”
Barrett went to the 10th-floor room and saw that a maid was cleaning the one next door, so he requested to stay there.
“So I went back to the front desk and told them about the room,” he explained. “They went back and verified for me that it was ready, and they checked me into that room.”
He knew he’d been put next to Andrews, because he could “hear her talking on the phone” on his way in, he said. Their rooms were in an alcove, hidden from view by anyone standing in the hallway, Barrett said."
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Well, the hotel is liable if their house phones (like the one in the restaurant) show room numbers. Certainly the hotel should have known that.
The fact that the rooms were in an alcove explains how he was able to spy w/o others in a typical hotel hallway would notice. I always wondered about that aspect.
How did he know each time which hotel she (and maybe other ESPN staff) would be staying in? I know that when ESPN travels to smaller towns, there often isn’t many nicer choices to put their staff in, but in decent sized towns there probably would have been several possibilities.