I enjoyed watching it, but the chem stuff isn't always accurate. I mean, nobody in their right mind would cook meth on a Bunsen burner(hot plate or heating mantle, please folks!). And you'd do best to contain the vapors produced by the reaction, a length of tubing from the top of the condenser to a bucket of basefied H2O, they just sport gas masks and let the gases roll out the top of the trailer. Jesus!
But then again, it's TV, visible bright flame and thick toxic smoke look cooler than lab safety.