Continuity mistake: When Ace is trying to work out what Einhorn and Finkle have to do with each other, his dog sits on a photo of Finkle and its hair does not cover the face, the shot moves to Ace and then back to the dog and now its hair is covering the face of the photo without even moving.
Continuity mistake: When Ace is in the asylum, he is trying to hide in a little cardboard box from an employee of the building, so he crams himself into a box and when the man leaves he breaks out of it. He ends up completely squishing the box underneath him. When the camera comes in for the close up shot, the farthest side of the box from the viewer is now undamaged.
Continuity mistake: When Ace is sneaking into Ronald Camp's Private Aquarium, he begins to look around and open some doors. If you look at the colour of the wall it is red. When he opens the door to the giant tank, the wall outside the door (which should be red) is now white. The door also reverses - the handle goes from Ace's left to Ace's right.
Continuity mistake: At the end of the mission impossible music, where Ace is sneaking into the billionaire's private Aquarium, there is a plant in the hallway shown from outside of the building when Ace swings opens the door. When he slams the door shut and is inside the building no plant is there.
Continuity mistake: In the apartment crime scene, Sean Young says "we'll let you know if we find a tic", and the large grey-haired cop on her left chuckles, arms by his side. We then cut to a close-up of him with his hands on his hips, pushing his jacket to the sides, then back to the original shot with his hands by his sides again. The close-up itself is a bit weird - Sean Young should be right in front of him, but isn't visible. They must have used a later shot, because after about a minute, when everyone's moved around a lot, we see him back in exactly that position, only now the people visible fit the scenario better.
Continuity mistake: In the opening scene, someone is crawling through the shattered rear windshield of Ace's car while it is in motion. They show a shot from inside the car and the guy has about half of his body in the car. When they show an outside shot, his hands are barely inside the car. Then, in the next inside shot, half of his body is still in the car.
Continuity mistake: In the scene where Ace is trying to find a connection between Finkle and Einhorn, there is a shot of his monkey walking along a mantelpiece to the right hand end. There are 2 photos in frames on the mantelpiece, one of which is right up against a heavy book that is flat on the mantelpiece. In the next shot, zoomed in on the monkey jumping on the book there is no sign of the photo that should be touching the book.
Continuity mistake: At the beginning of the film when Ace is kicking the box down the apartment's hallway and he says, 'We're going downtown.', before he says that the box is up against the wall in a normal position, after the close up of Ace saying this, the box has moved to a different position.
Continuity mistake: When Ace is talking to the dog in Roger Pedactors apartment (after his death), he picks up the dog when Einhorn approaches. As he is picking up the dog he places his left hand around the dogs neck. In the next split second shot his left hand is around the dog's body.
Continuity mistake: Near the beginning when Ace is in the parking lot of the stadium for the first time, there is a person walking in the background as Ace swerves his car. In the next shot, it shows two people watching him drive, and then when it goes back to Ace's driving, the man walking in the background is gone without having enough time to walk out of the camera's line of sight.
Continuity mistake: When he is in the aquarium tank (just after he says "I've got to, mister!"), he leans down with his glasses in his left hand. He's supporting his weight on his hands so can't move them, but in the next shot from behind his left hand's flat on the ground with no glasses in sight.
Continuity mistake: In the scene where Ace is trying to figure out the Finkle/Einhorn connection there is, what looks like, an air horn on the far end of the table to the right of the dog. A shot or two later when it shows the dog's hair around the picture of Finkle you can see the end of the horn laying right next to the dog on his left side.(This is visible in the screen shot already on the site that shows the dogs hair position changing.).