During the scene at Elysium where everyone is sitting around the 'truth circle' and George is given a bowl of Ayahuasca tea to drink, he smells it and passes it to Linda saying that the tea "smells like Willie Nelson's braids". Willie Nelson was the name of Paul Rudd's character's pet dog in the movie Our Idiot Brother (2011) which, incidentally besides Paul Rudd also starred Kathryn Hahn.
When Seth is playing the guitar singing for Linda his hands are different than when he has stopped playing. In particular his thumb nail is longer while playing and than when stopped.
The people at Elysium say that they don't clap because it's "too aggressive". But after they help George and Linda set their car upright, everyone claps.
When George takes his brother's Escalade it is the current version of the car but when you see it again minutes later it has switched to the previous generation model.
"Get Your Body" by Baby. The complete list of the remaining songs can be found here with scene descriptions.
Q
Is the 'micro-loft' filmed in a real apartment?
A
No, George and Lindas micro-loft was created on a soundstage in Atlanta. It was Aaron Osbornes (Production Designer) favorite set. He says, It is the smallest set Ive ever designed, yet it had to hold a lot of people for filming. Everything was designed to break away and roll away. It was a little tricky, but we wanted to give the audience a sense that the characters gave everything up to be in this teeny, tiny space. It had to look good enough yet small enough so they would say, Why are we here?