Miscellaneous: During the chase in the drugstore, you can see several bystanders watching the filming from across the street.
Continuity: When Frank starts to sit down next to Jeanie at the club, his cigarette is in his left hand. But in the next shot, while he's still in the motion of sitting down, it's now in his right hand.
Revealing mistakes: After finding out who's in the photo, Bigelow leaves the photography studio and immediately starts getting shot at. He heads toward the factory (screen right) where the shots are supposed to be coming from, but all the shots being fired and ricocheting off the ground, pipe, barrel, etc. are coming from the other direction (screen left).
Revealing mistakes: When Dr. MacDonald is showing the test tube that supposed to contain the poison liquid that glows in the dark and moves it around, you can see it's really a solid substance, and not a liquid.
Continuity: When the bus stops in front of one of the henchmen chasing Frank , the front door opens, but when they cut to the inside of the bus, the door is still closed, and remains closed, until Frank gets up and goes out the rear door.
Continuity: When Frank leaves the St. Francis and gets on the cable car, it is going towards the end of the line on Market Street, a few blocks away. But in the next scene, the cable car is going uphill in the opposite direction.