The victim's body was shown being cremated in a 55 gallon drum using a large quantity of unleaded gasoline. The perpetrator is shown standing very close to the drum as the gasoline is lit. The resulting fire that is far too small, and should have been much more explosive given the amount of gasoline ignited.
Diesel fuel does not light on fire when a lot match is thrown into it.
After Mr. Dorsey hands [Nick Stokes] the printout reporting that there were no Hydrocarbons in the soil sample, he tells him that Hodges is at a conference. The printout however clearly lists Hodges as the operator.