When driving away from the swap meet after the records have been stolen, Trent says that they still have multiple copies of Boston. Boston's 1976 debut was, for many years, the best-selling debut album of all time, so it is not unthinkable that they would have multiple copies of it.
The character Coyote bears a resemblance to Rob Reiner's character, Michael Stivic, from All In The Family, who was also a hippie like Coyote. This may or may not have been intentional on Mike Judge's part.