When Simmons shows Coulson the "brain cells", they clearly lack axons/dendrites, which are branchings from the cell walls that make neurons easily identifiable. Brain cells normally use these branches to produce tiny electrical impulses. The cells shown look like red blood cells.
After examining a fried brain, Simmons says it's been hit by 2,000 mega Joules of electricity, and notes that is almost double the power of a lightning bolt. Albeit there is no real minimum or maximum power for a lightning bolt. All lightning bolts vary wildly in power so the concept of double the power of a lightning bolt makes no sense.
The goof item below may give away important plot points.
SImmons is standing at the edge of the open hanger after "trapping" Fitz in the lab. He's screaming for her not to jump and he's pulling as hard as he can on the door trying to get it open.
After Simmons jumps, he hurries to the table and grabs the "ANTISERUM", LOL, and the delivery device he made. Than, with touching nothing else, he turns from the table and goes running through the now wide open lab door.