Continuity mistake: When Gino and Arliss are given the contract to kill Agent 11, note the distinctive pattern on the shirt Arliss is wearing - particularly the collars, which keeps changing even within the same scenes. Though the actor's wardrobe consisted of black shirts of the same style, their patterns varied. For example, during the scene at the pet store there are at least three different patterns seen on his shirt. The same thing happens again later with a different shirt Arliss is wearing, after the scenes of Gino and Arliss at the dog training facility.
Revealing mistake: When Gordon falls with the broken drain pipe his yellow boxers are ripped off, but when he lands on the grass, even though we know he's supposed to be naked, we can see he's wearing white briefs in the side shot.
Visible crew/equipment: When Gordon's locked out of his building he climbs up the drain pipe, and while the pipe sways back and forth we can see the safety cable attached to Gordon.
Continuity mistake: When Spot witnesses the purse snatching he's suddenly wearing a collar, which promptly vanishes again.
Continuity mistake: When Agent Sharp switches the ID tags on the animal crates, the ID tag on Agent 11's bars changes position between shots.
Continuity mistake: When Gordon tastes the bran cereal with soy milk and prunes, the cereal box is on the table beside the soy and regular milk cartons, but when he's gagging by the sink the cereal box has vanished, and then it reappears.
Continuity mistake: When Gordon fixes himself the bowl of bran cereal with soy milk and prunes, he places the orange cap back on the soy milk, but when he tries to eat the cereal and spits it out, the soy milk cap is gone. Then it's back on the bottle, before it's off and back on again. (The regular milk cap is pink).
Continuity mistake: Tyson, the dog on the chain, escapes and snaps the chain right in the center. When he reaches the tree, the remains of the chain are gone.
