At almost exactly the 9 minute mark, when Brian and Joe are writing the true crime book in the bar, Joe wants to list three cities in their book, New York, Paris, and Kokomo. Brian responds by telling Joe, Kokomo isn't a real city. There is a real city called Kokomo. It is in Indiana with a population of around 60,000 and is about 60 miles north of Indianapolis.
Peter's boss refers to him as being mentally-challenged, and Peter says he isn't. However, it has been previously established in the show that Peter is technically clinically legally Mentally Retarded (a fact which has come up in episodes after the one which declared it, so it's established canon and not a throwaway idea for one episode). Since it's the reason that Peter was hired, he would still be an Inclusive Hire for the store. Peter doesn't have grounds to deny the label.
Lois gives the PLU number for kale as 6029. The numbers for kale are 4627 (regular), 3095 (multi-colored) and 3446 for kale sprouts. 3166 is used for Tuscan cabbage, aka lacinato kale. These are the numbers on the small stickers on fruits and vegetables at the grocery store.