So what are the qualifications exactly for being an NFL replacement ref? It seems that all you really need is a whistle. Forget that whole "understanding football" thing, just get out there an wing it.
The scab refs now have their own tribute song in the spirit of Flo Rida's "Whistle". So blow your whistle, replacement ref, blow it hard and wave your arms around like you just don't care. If all else fails, throw your yellow flag out and pray to the NFL gods that somebody else gets blamed for the bad call.