"By the time they've been fawned over by 25 gorgeous women, they start to really, you know, feel it a little bit. Night one, they'll come up to me and say, 'Mike, Oh, thank you sir, for this wonderful opportunity.' And by night two, they're ordering people around: 'Where's my Evian?'" Fleiss joked.
Contestants are barred from watching TV, and using phones, laptops, or ipods, during the show.
"It's kind of shocking because for the first few days you're going through withdrawal of everything in your life. And it definitely feels like a bubble," said ABC News special correspondent Melissa Rycroft, who was a contestant on the 13th season of the Bachelor. "We are our chefs and own housekeepers, our own makeup artists…We did it all ourselves."
The total isolation and extreme dating amp-up the intensity and speed compared to a traditional courtship.
"It takes [dating] back down to the basics," said Pavelka. "That's what 'The Bachelor' franchise is all about is cutting away, just the crud that the world inundates you with, that makes a relationship tough."
For Harrison, who's been front and center for 19 seasons, the awkward moments keep it interesting.
"I relish, and maybe it's because I've been a part of this so long, I really enjoy awkward moments," Harrison said. "I mean, I love creating them, I like seeing how people react. I don't mind it at all."
Harrison recalls how Season 5 Bachelor Jesse Palmer forgot a woman's name during the rose ceremony.
"He's looking over here at a girl whose name is Ashley, and Kelly walks up, and he's like, ooh! That is still one of the greatest Bachelor moments ever. It was great," Harrison said. "And I don't know why he tried to pull it off and didn't just stop and go, I, you know, it's 4:30 in the morning, I forgot the girl's name."
Even the roses, which are famously given to each woman when she advances to the next round, have been the source of some trouble.
"I went to say the girl's name, and the top of the rose fell off," Season 4 Bachelor Bob Guiney. "I was like, oh my God, what am I going to say? Will you accept this stem?"
Amid the off-camera hook ups and the behind the scenes drama, the essence of the Bachelor is the emotion.
"It's a sweet show," Fleiss said. "It's a show about love and it has a lot of heart."
Fleiss said they shoot each season over the course of seven weeks -- longer than most reality shows -- because they want real emotion and real connections to develop.
"Our blood, life, tears -- everything -- are vested in these people," Harrison said. But "the reason this show has always remained very genuine, there's nothing to it at the end. There's no million dollars. There's no promise, there's no gimmick. At the end of this what you're given is your life. Go. You want to stay with this person, great. If not, great."
For the show's creator, a season where emotions go beyond a proposal is his fantasy.
"One of my dreams," Fleiss said, "is that a couple will fall so madly in love during the course of production that when it comes time to shoot the final episode, the final rose ceremony, they demand a justice of the peace be present, and they actually get married right there on the spot."
Watch "Inside the Bachelor: Stories Behind the Rose" on a special edition of "20/20," Monday, March 15 at 8 p.m. ET