Continuity mistake: In the pet shop, Gordon gets all wrapped up with plastic wrap. Just a few short scenes later it's gone. There's no way he could have gotten himself out of it in that amount of time. Also, the "plastic" fishbowl shatters - plastic fishbowls like that are not that rigid and would not break like that. Add to that the "piranha" tank is obviously a bubble line at the back of the tank - you can see the bubbles come up when they reach the fishnet in.
Continuity mistake: During the end of the movie, spot is in the park again, and when he looks at the bad guys, he has a collar on and then when he looks back, it is off. This happens for a minute or two.
Continuity mistake: Towards the end, the mail truck has a reflector hanging outward on the driver side. Later scenes, it's back in place.
Continuity mistake: When the boy gets a call from his mom, she is far away from the truck. When it spits mud up, she is right next to it.
Continuity mistake: In the opening sequence, the driver's door on the mail truck is wide open. When the protagonist arrives at his destination a moment later, the door is closed.
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.Super Grover
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).Super Grover