Charlie's middle name is revealed to be "Edward", but in Harvest (2006)(#2.14) his driver license shows no middle name.
Val Eng & Don Eppes supposedly went to high school together but Christina Chang is nine years younger than Rob Morrow. Even if you use Don Eppes fictional DOB of July 15, 1967, that put them four years apart, so Val would have been in 8th grade when Don was a senior.
Charlie says Phosgene can be made by mixing certain household cleaning chemicals. That is not correct, Phosgene is produced by passing purified carbon monoxide and chlorine gas through a bed of porous activated carbon, which serves as a catalyst. The writers are confusing it with Chlorine gas, a poisonous gas that was used in WWI which can be made by mixing two household cleaning products.
When the FBI team enters the house to arrest Glen Nash, he exists the kitchen with a towel in his right hand. Don demands that Nash get on his knees and the camera cuts back to Nash but the towel is gone.