Corrected entry: Turns out Oliver was handed an unloaded weapon by evil Quentin. But Oliver's handled enough weapons in his time to know that a gun with no bullets is noticeably lighter than one with, and would have realised the ruse immediately, certainly not then trying to threaten Quentin-X with it.
Corrected entry: At one point near the end of the episode, Professor Stein says to Barry, "That event has an energy level of at least 6.7 teraelectron volts. It cannot be stopped." One TeV is a measurement used in particle physics and is a very small amount of energy, approximately that of a very small flying insect. Hardly a proper measurement for a huge, catastrophic event.
Corrected entry: Particle accelerators have to be a perfect vacuum in order to work properly, otherwise the particles inside would constantly collide with the air molecules. This means Barry couldn't possibly be running inside, because he doesn't have any breathing apparatus with him.