The guy Park follows walks down a street, goes up stairs and ends up in the same street as before, where no stairs can be seen.
When Ressler enters the FBI lab, the identifying sign, 'Scientific Analysis: Chemical Unit', is on the inside of the door's glass panel. It should be on the outside.
The 'NO SMOKING OR OPEN FLAME' sign in the FBI Scientific Analysis is redundant. Smoking has long been banned in American public building and has never been allowed in chemistry laboratories.
The dash cam footage is moving sideways. Dash cams stay static and can't move.