Newsarama.com covered the panel live. A few tidbits:
Tyler plays a drug addict in the film. Fillion asks her how she allowed someone to actually stick a needle in her foot for one scene. She said she didn't mind because it was a real nurse, and it was just water that they injected.
"If I were half the woman you were, I'd be twice the man I am," Fillion said.
Wilson's Twitter following, currently at 1.7 million is brought up. Tyler joked that "he twitters during scenes sometimes."
Fillon, another popular Twitterer, also chimed in: "Rainn twitters too much."
Tyer called the shoot a "really quick, guerilla-style production. It was intense."
Liv made a plea to Cheap Trick: "Cheap Trick," Tyler called out during the panel for the R-rated superhero film Super. "Hellow if you're out there. There's a song of yours we really want to use and we think you're amazing and we love you. Could you please let us use it for almost nothing?"
Liv didn't use a double for injection scene: Liv Tyler doesn't like hand and foot doubles, so she actually had fake heroin shot up her foot with an actual needle, which prompted Fillion's response "If I was half the woman you are, I'd be twice the man I am.
About playing a drug addict: Liv Tyler got into the mind of a drug addict by spinning in circles in her trailer while taking the occasional shot of whiskey.
Update: Liv was hanging out in some other places at Comic-Con, like in "The Other Guys" panel (visiting her friend Eva Mendes) and toyingaround in a mask!
Update 2: First video from the Super panel on YouTube!
Update 3: Another video showing a bit of Liv talking about her foot at Radaeonline!
Update 4: Even longer video, with more Liv, on YouTube!