There’s a lot to be said about “Big Brother.” It is a reality show that, beyond its three weekly episodes, also streams a 24/7 live feed of its contestants as they compete for $750,000. It’s a thrilling concept, one that attempts to push reality TV to its extreme. As houseguests are voted out week after week in a process called “eviction,” they form alliances — and break them — trying to be the last one standing. It’s often hailed as more of a social experiment than reality TV, a shiny Los Angeles “Survivor” counterpart. But the start of its most recent season has proved that the crux of any reality TV show is its casting. And with “Big Brother,” the question is, how familiar should these players be with the game before they enter it?

“Big Brother” is played in a pretty consistent forma

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