I imagine this is going to be a quite common occurrence.  On a semi-related matter, I had a return with Form 2441 credits that I did not hit the residency box but fortunately they had enough tax so when it appeared as nonrefundable it was fully allowed.  I am not going to amend since it has no effect on tax.  But I would bet this is happening a lot. 

It would be nice if there was a diagnostic on both of these but once you miss it and realize it, you won't miss it again.