Trees eyes and antlers
Sometimes, very different organisms can end up having traits in common, even though they didn’t share those traits with an ancestor. Instead, different systems, solving similar problems, can come up with similar answers.
Here’s a link to the episode on eyes.
Here’s a link to an article about the similarities between human and squid eyes.
Here’s a link to an episode about a large single-celled creature that came up with leaf like structures.
Here are the best links I could find about the antlered fly. There was surprisingly little information about them on the internet.