Near the ending, after the fight at the fifth column meeting in the toy store basement, Ebbing (Conrad Veidt) escapes and intends to blow up the American battleship. He orders Pepe (Peter Lorre) to help. Pepe refuses and is shot. He tumbles down the stairs dead. Moments later Gloves (Humphrey Bogart) runs up the stairs, but Pepe is nowhere to be seen.
The "newest battleship" that the Nazis want to sink is either the old "Nevada" or the old "Oklahoma", both built during WWI.
The slice of cheesecake shrinks as it is brought from the kitchen to the table.
(at around 1h 4 mins) Gloves' car has been shot at and has spun out. The first scene shows everyone getting out of the car, then the inside of the other car is shown, and then everyone is seen (from the side) getting out of his car again.
(at around 16 mins) Gloves is sitting in an armchair. A glass is on the arm, and it is clearly visible when the phone is brought to him. The edge of the glass is visible at the bottom of the screen through the phone call, but when Gloves stands up and the phone is taken away, the glass is no longer there.
When Ebbing shoots Pepi, the gun, while being raised, is at a 45 degree angle when fired. The bullet would have struck Pepi in the foot or leg, not the chest.
On the office door at the toy warehouse, there appears to be a deadbolt lock on the door about a foot above the doorknob. However, there is no corresponding bolt and plate on the edge of the door. This is a shortcut often taken by set carpenters.
Leda is bailed out of jail, grabbed by Pepi, and pulled into a car. Sunshine sees this, runs back to Gloves and the gang in another car, reports and gets in. Next shot is a long shot of three parked cars. The first one pulls away, and there is a very subtle edit before the third car follows them. The telltale marker of this edit is the change in the rising exhaust smoke from the first car.
During the car chase, the steering wheel of the Nazi's car is completely out of sync with the background seen through the car's windows.
During a fight at the taxi, its open door closes itself.
Leda is bailed out of jail but she is not told who bailed her out. She's abducted into a car on the street. Normal protocol should have required her being told who bailed her out as it might have been (and was) done by a party intent on doing her harm once out of police custody.
Camera shadows move over a table when Gloves is searching the basement.
Gloves says the warehouse (which is on the waterfront) is "two blocks off 5th Avenue". Fifth Avenue is almost dead center in Manhattan, nowhere near the East River.
Additional information: In 1941 Lower Manhattan, the East River could indeed be considered a couple of blocks from 5th Avenue. Landfill and construction in the subsequent decades has changed Manhattan's geography considerably.
Additional information: In 1941 Lower Manhattan, the East River could indeed be considered a couple of blocks from 5th Avenue. Landfill and construction in the subsequent decades has changed Manhattan's geography considerably.
Gloves (Bogart) consistently mispronounces "columnist" when he says "fifth columnist". He says the word with a long U (as "you"), rather than kol-uhm-nist, with a short u, the correct pronunciation.