Last week, Guardians of the Galaxy director James Gunn teased new details about this Marvel Phase Two adventure in an interview excerpt with Pointless Podcast, including why the Skrulls aren't in the movie and the characters he's saving for the second trailer. The full, hour-long version of the podcast debuted today, where the director offers more details about the movie, including Rocket Raccoon's origins, Vin Diesel's process of saying "I am Groot," the Infinity Gauntlet, and how Thanos in this Marvel movie universe may be different than the comic book version.

First up, the filmmaker talked about how Vin Diesel became the perfect embodiment of the tree-like Groot, even though he only has one line of dialogue.

"All of the 'I am Groots' that were earlier voices didn't sound very good at all, they sounded like sh#t. It just didn't work. Then Vin Diesel, came in and, in one day, lied down all these 'I am Groot' tracks, and he's a perfectionist. He made me explain to him exactly what (Groot) was saying. Then Vin would just sit there and he would do it and he would do it again and again and again, and his voice is so rich and so beautiful and he really opened up and he was this character. It was amazing when we first put that voice in there how much the character changed and how much he influenced the character. The ways in which Vin Diesel says I am Groot, I am astounded."

He also confirmed that they are doing motion-capture with Vin Diesel, similar to what they did with Bradley Cooper's Rocket Raccoon.

"We're doing some mo-cap. What we're bascally doing with Bradley and my brother Sean (Gunn), and with Vin Diesel, we film everything that they do so we can use it as a reference. So while they're recording it in front of a microphone, we'll have Vin acting out everything and doing all the acting and we'll record that."

The filmmaker also teased details regarding Rocket Raccoon's origins.

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"Rocket is a result of countless and cruel, illegal genetic experiments, where he's been turned--from an innocent little creature, where he has an IQ of three, and he becomes this thing that's completely alone; this gnarled little beast. He's pretty sad."

He also talked about one of his favorite scenes to film, which is where Peter Quill (Chris Pratt) is imprisoned, early in the movie.

"There's one shot that I'm thinking of; the characters are imprisoned early on in the movie and there's this overhead shot of Peter Quill and he's sleeping on the floor in what we call the Locked Up Abroad shot. It's Quill surrounded on the floor with all these different aliens, disgusting, they're all sleeping, packed together like sardines. It was just a really beautiful shot and we have it overhead completely with the camera slightly revolving as he's sitting there wide awake and all these gross aliens are asleep around him. I was able to take time and compose the shot in the same way you would design a painting, and changing little guys. It wasn't like it took an extraordinary time to do it, but we took some time at doing and that was something that I'd had really never been able to do in my entire career."

He also spoke about how Thanos and the Infinity Gauntlet fit into the story, teasing that this version of Thanos may be different than the comic book iterations.

"Here's the thing, truthfully the Marvel Cinematic Universe takes out of both the 616 and Ultimate Marvel Comics universe, and then they recreate some elements themselves. What Thanos wants in the comics is not necessarily what Thanos wants in the movies; we don't know yet."

CLICK HERE to listen to the full one-hour interview with Guardians of the Galaxy director James Gunn.