The plot of the previous episode revolves around Chandler answering phone calls at Joey's apartment about Joey's audition for Mac and C.H.E.E.S.E., and Joey not getting the messages. But in this episode, Joey has a cell phone, upon which he should have been getting those calls about the auditions.
At the beginning of the episode when Rachel is reading Chandlers horoscope, his arm switches between being on the back of the couch and being folded across his chest between takes.