Oh I get the parallels and the vibe is unquestionable. I thought you meant more overt references.The whole movie had a Firefly feel to it.
The bunch of losers doing the best they can with what they've got.
The "friends are our chosen family" motif.
Goofy shenanigans amidst some really heavy stuff going down.
Star Lord's duster.
The scene where Drax explodes Nebula for calling Gamora a *****, after Drax himself just called her one.
Am I the only one who got a Firefly vibe from Guardians?
I just did a search and found an article that claims Rocket's Hadron Enforcer has bits that look like Serenity. Frankly, I'm not seeing it. There's one bit that looks a little like the engine nacelles but the rest looks like a bit of a stretch.