The Crochet Time blog has an entire category that discusses crocheted blankets seen on TV. The blog’s author figures out the patterns and yarn types used in all kinds of throws and blankets from tv shows like Roseanne, Mad Men, Taxi (as seen above), and It’s Always Sunny In Philadelphia. Most of the afghans use a variation of the basic granny square but there is great variation in color, style and stitch.
If you google around you’ll find all kinds of people replicating blankets from their favorite tv shows. Things like this are why I love the internet.