When Joe enters Alex's apartment, he makes the same joke as Brian did in the previous scene (about her place looking different through his telescope). However, in the earlier episode "It May Have Happened One Night," Joe claims that he took Alex home, went with her inside her apartment, and even carried her to bed when she fell asleep on his shoulder. Unless she has since moved, he has already seen the inside of her apartment before now, making the joke strangely out of place.