So the preview starts off with the rap sheet scene with every Guardian, with more detail on each character (for example, Gamora's rap sheet did show Thanos's head, & his link to Ronan, as well as listing Gamora as Thanos' adopted daughter). Star-Lord's middle finger wasn't censored, but it didn't have the "OBSCENE GESTURE ALERT" sign. Then we get an Abby Road-esque walk towards prison. There's a nice exchange between Peter, Rocket, & Groot which confirmed that Rocket isn't a raccoon in this movie (he didn't even know what a raccoon was), and it was mentioned that Rocket was well aware of Gamora, where it was revealed by Gamora that she wants to betray Ronan & get the orb for a third party, likely The Collector. As they walk, Peter finds his Walkman, which proceeds to the scene where the blue Nova officer was listening to Hooked on a Feeling then zapped Peter, this leads to Hooked on a Feeling playing in the background for a while. Then we go to a shirtless scene with Star-Lord being sprayed with orange gunk (likely cleaning fluid) leaving him slightly orange & pissed, but you've probably seen the shirtless-&-pissed part.
The part that hit me emotionally was when they showed Rocket's back, which had tons of mechanical nuts & bolts, showing signs of what was done to Rocket. When they get to the main area of the prison, People seem pissed at Gamora, which is when Rocket pointed out that Ronan & his goons killed a lot of their friends & family, hence their anger towards Gamora.
A few of the aliens were starting to gang up on Peter, calling him "new meat" (my gut was telling me prison rape), specifically the big blue alien that was standing in front of Peter. It was there that Groot put two fingers up the giant blue alien's nose & started to grow inside said now, and from there Rocket gave his "This one here's our booty" speech. Afterwards, Rocket devises a plan to get out, saying he needed the prison remote (which was connected to the inside of the arms of some of the guards), a prosthetic leg, & another part that absolutely needed to be taken last that's high up in the prison (I think it was a power generator, given what happens next) in order to use the watchtower to escape.
As they were talking, Groot pulled the thing that was supposed to be taken last, thus killing the power in the main hall of the prison and alerted the guards. The drones came in & opened fire on Groot. Rocket went to the rescue, but lacked any firepower. Then Drax pops in out of nowhere, beat up a few guards, and threw Rocket one of the officers' guns, which lead to the "Oh....yeah" moment which sounded slightly different than the trailers, then he opened fire on the drones with Groot (it looked amazing). Gamora fought her way through some guards, then immobilized a guard that had the remote Rocket needed. Gamora requested for the remote somewhat jokingly, and then the guard said that it was connected to his arm internally and that it couldn't be removed, Gamora responded with "That can be arranged" or something like that. Then Star-Lord asked the one prisoner for his prosthetic leg. When he got it, Star-Lord was stopped by a guard, which he later proceeded to beat the crap out of the guards with the prosthetic leg.
Afterwards, everyone starts to climb up Groot's extended body up to the watchtower. Once they got to the watchtower, Gamora questioned why they were bringing Drax, and Peter answered that if Drax helped them excape, Peter promised that Drax would be able to get his revenge on Ronan. It was there that the Nova officers started to shoot the top of the watchtower. At the last second, Rocket made it to where gravity was shut off for everyone except the Guardians. It was from there that the Guardians went through their joyride escape, with some banter along the way (from Drax's metaphor moment to Gamora being surrounded by idiots).
Then they hit the closed exit. Then we see an extended trailer, which ends off with an extended version of the "I have part of a plan scene", which is beautifully done (even Rocket went on to try to pass off his fake laugh as real, even more than what was shown in the trailers). Even Drax questioned Star-Lord's plan.