Factual error: Don Jon is set in a New Jersey town. A commercial for Hardee's/Carl Jr's restaurants comes on the TV during a family dinner. These restaurants are not in the New Jersey/New York area at all.
Trivia: When Jon throws the used tissue into the bin, it makes the same sound as you delete a file on a Macintosh computer. A small reference to the MacBook (and its sounds) that Jon is using in the movie.