Willy uses the stamp stuck to his finger to add Phelps's signature ("Wilkins") to the sign-out book. Later, when the guard checks the book, the signature is there, but the one below is missing and the other signatures have changed places.
Mr. Phelps finds the instructions on a cassette tape, which has a black and a white side. When he puts the tape into the recorder the black side is uppermost. In the close-ups, only the white side can be seen. In the final shot, the black side is up again. As Mr. Phelps disposes of the cassette in a bucket of paint, the sides flip yet again in between a shot of him about to put the tape in and a closer shot.
In two of the close in shots of Rusty walking the platform towards the seal, the section he walks onto overlaps the one he walks away from, as if it was filmed on his way back. The sections fit inside each other as one travels away from the seal.
After Jim rides atop the elevator to the top, it starts down almost immediately. It didn't wait long enough for the doors to open to let passengers on or off.
When Phelps is talking about the rivets, he says that he is billing 3.5c per rivet, but is being paid 35c, so he is being overpaid by 10x. Since he is being overpaid by 31.5c, he is being overpaid by 9x, not 10x.
There is no way that a punch card, like the one Jim inserts in the machine, could cause anything to happen, especially not the sorter which is the one that appears to go haywire.
At the worst, if he'd managed to make the edge of the card that goes through the machine first a little fatter, it could have caused a card jam. But, that would have meant putting his card into the stack of cards that was to be sorted. Where he actually put it would only cause an error when it was read.
Monitor 1 turns on before the guard pushes the button.
When Cinnamon drops the pill into the bowl of water, it begins to effervesce immediately. It would be plainly seen from Taggarts view. Yet he nor Conway react to investigate.
In the beginning of this episode, when the team is preparing in Mr. Phelps condo, Barney demonstrates to the team what Rusty the cat is capable of. He instructs the cat to retrieve Cinnamon's pearl necklace that was placed in a pouch by Phelps, for Rusty to find. Rusty pulls off the retrieval of the necklace flawlessly, but when he walks back to Barney, one can see a hand holding a reward for Rusty in the left part of the screen (it is barely visible). Rusty takes the treat from the hand. The hand is not Barney's, because both his hands are visible to pick up Rusty and the necklace. As there was no-one else of the IMF team even close to Barney at that point, one can only assume it is the hand from a member of the film crew to give the cat the treat that was used to lure him in in the first place.