Charlie is shown sleeping on the left side of the bed with Alan in the hotel room, but in Pinocchio's Mouth (2008), Charlie insisted and argued with Chelsea that he always has to sleep on the right side of the bed. However, lack of consistency among episodes of sit-coms is not considered a Goof according to IMDb guidelines.
Charlie leaves and tells Chelsea he's staying in a hotel. At the same time, Alan gets kicked out and shows up at Charlie's hotel room. However, Alan didn't speak to Charlie, so he wouldn't know which hotel (and hotel room) Charlie was staying in.