I'm following this tutorial:
https://www.youtube.com/watch?v=WxMwa0njGSM
on modeling. At 18:52 before adding a subdivision surface modifier my object looks like:
After subsurf:
It looks like two overlapping planes but I don't see the vertices that create them (I've already cleaned up double vertices).
How can I remove that face so that I don't get that wedge after subsurf?