http://www.thefa.com/news/2017/nov/13/emirates-fa-cup-fourth-substitute-extra-time-first-round-onwards-131117 I assume it's still the same this year, dunno if you're allowed to use two in extra time if you've only used two in normal time though.

I wonder if both managers know they can use another sub in extra time?

David really isn't the modern play it out from the back keeper

Surely someone on the pitch can take a better set piece than Smallwood

Well I reckon Brereton's been quality