[rcxdude]

I've seen such things pass through multiple layers of review. It's the kind of thing everyone knows to look for but takes a lot of effort to catch.

[buescher]

"Can" does not mean "always will without fail". On the flip side, you will never catch things in review if you don't review.

Having a specific review for new parts helps to keep footprint errors from "passing through". I've never seen a general layout review catch a footprint error: if you're used to using internal library parts, no one thinks to check them.