What's the differenc between "SubD friendly" curves and not?

Experimenting with this video and its mouse example. I made my curves forgetting to set them to “SubD friendly.” I have gotten some odd results but would like to know how this option affects the objects before remaking them. Further, can I make curves SubD friendly after the fact?

Did you watch that video?
I recall there was a very good explanation on specifically what that means in it.

https://docs.mcneel.com/rhino/7/help/en-us/index.htm#information/subdfriendly.htm

– Dale

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Went through it twice. Perhaps I missed the explanation.

Take a look at 20 minutes in at the start of the Mouse design.