Just after DNS Agents capture Kaylee to force her to shut down her website there is an aerial view of the compound. The smoke that is being "expelled" from the building is actually being sucked in.
When the two men meet up with the girl with the gas can, they are riding in a 2005-2007 Ford Super Duty with a 6.0L PowerStroke turbo diesel, these engines idle quite loudly and the sound of it does not match at all. Especially when they got back into the truck, the starter and engine audio do not match up to this generation of PowerStroke, sounded more like a gas.
Near the end of the episode, the characters watch a car drive away for about 8 seconds. When it then explodes, it's not moving and is still unrealistically close.