In the long shots of the lighthouse, particularly when the cousins visit Joe, there is no ocean behind it but rather a narrow lake with a shore on it a short distance from the near side.
In the first episode, Mickey said that Curious Goods was in Chicago. In the previous episode, Ryan wore an Illinois t-shirt. Here it is stated that the shop is "just down the coast" from Whaler''s Point. Illinois doesn't have an ocean or whales.
McBride attacks Ryan in the cave, even though Ryan isn't one of the descendants. Micki mentions this earlier, saying that as a non-descendant she is safe from McBride.
In the close up of Barney where he thanks Ryan for the money he gave him, a boom mic is reflected on the museum door in the background as Dewey closes it.