Set Secrets from 'Wall Street 2'

Michael Douglas' Oscar-winning character Gordon Gekko is back in "Wall Street: Money Never Sleeps" -- but here are a few things you might not know about the other men on the "Street."

1. Star Shia LaBeouf met his real-life girlfriend Carey Mulligan, who plays his fiancée in the film, on set, but Douglas tried to warn LaBeouf about on-set romances.

"The fact that the two of them play lovers in the movie and ended up being lovers in real life, I warned Shia," Douglas told "Extra's" Terri Seymour. "I said that's a dangerous way to go, you know, because I remember as a young actor myself, thinking, 'Oh well, I'm supposed to be in love in the movie, okay, we'll get it on together,' then halfway through the movie, having some big fight, and then having to pretend I'm in love with this girl. She hates me and I hate her, all that." But Douglas winked, "Obviously, [Shia] listened to everything I said. They're here and happily ever after, so it's very nice to see."

2. LaBeouf admitted he wasn't even sure he had the chops to pull off the roll. "I'm like the underdog. I've been doing action films for five years. I'm the kid from 'Transformers,' you know, so coming on this set you've got Josh Brolin, Frank Langella over there, Susan Sarandon, Michael Douglas... I mean, it was so chock full of incredible actors. So for me it just felt really uncomfortable all the time, in rehearsals, and the only way I thought I was gonna be able to pull it off was to feel outrageously confident. The only way I was gonna feel confident was to know more than anybody else about finance."

3. Co-star Josh Brolin actually has some day-trading experience. "It was good, lucarative. I learned a lot about self discipline, but it's very boring. Every time I talk about trading, everybody gets the film over the eyes. Thankfully, this movie's about romance and sex!"

"Wall Street: Money Never Sleeps" hits theaters Sept. 24.