When Charlie is walking Marcy out of Rick Springfield's trailer, you see him holding his briefcase, in the next shot where Rick Springfield is gathering the cocaine, you see the briefcase is on the couch.
As Hank and Charlie are laughing about the size of Charlie's bonus, the paper check disappears from Hank's hand when the camera changes angles.
Whatever snake bit Runkle, it is definitely NOT a garter snake which has longitudinal stripes, not circumferential ones.