That interchange doesn't look too confusing to me, but it does look ripe for folks trying to merge at the last minute on the 101 (maybe trying to cut ahead or just really, really not paying attention).
Here is the signage at the start of the intersection:
View attachment 288725
Then this as you get closer:
View attachment 288727
I am not sure how to mistake that split as another lane unless you are right on it and have not been paying enough attention to the roadway to see the signs leading up to it.
I would guess the poor fellow was making a last minute swerve to get back on the 101 and didn't judge it correctly.
I will say we have a similar interchange I travel a lot down here at the 5N 14 split, where the HOV lane is a left exit to the flyover to the 14. They have put the white markings in the non-lane, but it doesn't help - folks still try to use the space to cut ahead of stopped traffic on the 5 all the time, playing chicken with the barrier.
View attachment 288728
Edit: I was wrong, perspective confused me.
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