What happens if a 'reveal' on a reality show is flubbed?

What happens if a 'reveal' on a reality show is flubbed?

Richard Hall (Reality TV Producer) gives expert video advice on: Do reality show producers 'coach' cast members during a shoot?; What happens if a cast member has a breakdown during a reality show shoot?; Are reality show storylines written ahead of time? and more...

When you give up a plot twist that no one, hopefully, was expecting. That is the classic thing - a reveal would be something like "You now have to switch partners." "You now have to pick between these two people", or "You have to vote some member off your team". Those are the classic TV show reveals. Of course, every show has different ones.