When pulling into the gas station, "Ken"'s BMW has a front license plate. New Mexico only requires (and provides) a rear plate.
When Jesse is waiting for the taxi, his brother asks him to return the joint, but instead Jesse crumbles it and tells him that it's "skunk weed", as if it's no good. In fact, "skunk weed" is widely regarded as being among the best varieties available. It's called "skunk weed" because it has a vaguely skunk-like scent. It's also called "sin semilla" (seedless) or indica as it's typically the indica strain and is cultivated to produce seedless buds. It often comes from Northern California and the Pacific northwest. However, it's clear that Jesse just said that because he doesn't personally like skunk weed.
The closed-captioning, again, lags behind the audio by about 2 seconds.
When Walt is changing his bandage for his leg wound he uses hydrogen peroxide to sterilize the wound. After he changes the bandage he notices blood on his pant leg and then proceeds to try and scrub the blood out of the pants with water and a toothbrush. Any good chemist (as Walt is) would know that hydrogen peroxide would clear that blood spot in a heartbeat and not damage the pant leg in the process.