I think these are the primary "racist undertones" referred to in the summary. Since murals like this exist and Parks and Recreation characterized the mural as inappropriate, this seems like a reasonable use of stereotypes.
So the episode tells us a couple of stereotypical images are bad. It then undoes whatever good it may have done by presenting more mistakes and stereotypes: Indians are museum pieces, Indians make baskets, Indians look like Plains chiefs. Nice of you to include Indians again, Parks and Recreation, but you're still not doing it well.
You can watch the episode at Hulu.com:
Parks and Recreation: The Camel
For more on Parks and Recreation, see Face-Cutting in Parks and Recreation and Twisted to Death in Parks and Recreation.