This week's episode of Castle, The Late Shaft (airdate: 4/12/10), included a couple mentions of Indians. Castle called his daughter "Sacagawea" when she went camping, and Beckett observed that a suspect was gambling at Mohegan Sun.
Normally I might not mention anything so minor, but this episode follows last week's Maya mummy mystery. The writers seem to have taken a sudden interest in Native lore. If it's not a coincidence, I want to give them credit for trying.
For more on the subject, see Maya Mummy in Castle and TV Shows Featuring Indians.