After Ace points out the blood stain on the balcony or Roger's, Lt. Einhorn touches it with her bare hand, something no cop would ever do. However, it is possible that she did this deliberately to contaminate the crime scene and make the blood evidence inadmissible.
In Einhorn's office, when Ace is shown from the back saying "We're talking paranoid delusional psychosis," you can see that the line was dubbed over, as it doesn't match the movement of his mouth, and he to move his mouth after the line has been spoken.
After the kidnappers put Snowflake into the truck the camera does a close up of the back of the van which is red.
In the next shot the camera does a wide shot of the whole the van as it drives off, you can clearly see that it is now blue.
When Ace is in the mental hospital as "Larry", he suddenly stops to do his half-time dance and then slams his head and face into the bench in the hallway. When he does this, the doctor starts laughing in an unprofessional manner.
When looking for the fish to feed Snowflake, the thug says "Where the hell's the smelt?" In the next scene where the second thug follows the trail of fish to the now-unconscious first thug, the fish are larger than smelt, most likely tilapias.
After Snowflake is captured, Melissa asks "Why did it have to happen now, two weeks before the Superbowl?" In a following scene with Ace, Melissa tells him that it's Superbowl week, and the dolphin was stolen "last night".
After Ace rescues the lost Shih Tzu, his car windows are smashed. In the scene after as he takes the dog/cat food to his apartment, the windows are no longer smashed. When he arrives at the Miami Dolphin's stadium, his windows are messed up again.
When Mr. Shickadance inspects Ace's apartment for animals, the doggy door on the fridge is a solid sheet of plastic, but when Ace calls his animals out afterward, the penguins exit through the doggy door which is clearly segmented.
When Ace is about to kick the package down the hall to the man's doorstep at the beginning of the movie, he throws the package up with his feet and lands flat, but on the scene he kicks it, it's in a vertical position.
When Ace and Melissa are at Ron Camp's party, Ron is talking to 2 women. One has long earrings and the other has short earrings. When Ron notices Ace and Melissa he approaches them and starts talking. In the background you can see that the girl over his should switches back and forth between the girl with the long earring and the short earrings between shots.
Before Sgt. Aguado steps on a roach at the police station to insult Ace you can see there are markings on the floor, which is also tile. Yet when Ace throws Aguado to the ground with his face over the roach you see no markings or tiles. It seems to be cement.
When Ace gets off the elevator, at the beginning of the movie, you can see that Ace clamps both feet on the side of the package causing a gap on the top of the box. In the next shot when Ace still has his feet clamped on the sides of the package, there is no gap on the top.
When Ace gets off the elevator, at the beginning of the movie, you see Ace kick the package to the door of the delivery. There is nothing but wall to the left of the door. However, when the man answers the door to the left of the door there is a tiny piece of a wall and a door right next to it.
When Ace is at his apartment walking back and forth with the monkey saying "Alright the answer is right there." You see the monkey above the fireplace standing on a red book. Directly behind the book is a picture. In the next shot when the monkey starts jumping up and down on the book the picture is gone and the corner of the wall to the right of the book is closer than the previous shot.
When Ace enters the outside door near the pool at Ronald Camp's home, the outside and inside shots are very mismatched. A large plant can clearly been seen in the hallway opposite the doorway from outside is missing on the inside shot, and on the inside shot when Ace slams the door there was obviously no actual door there; Ace was just miming a slamming gesture.
At the beginning of the movie, when Ace enters the elevator at the apartment complex the color of the elevator inside and the doors are light brown. When Ace gets off at the next level the inside of the elevator is green as well as the doors and does not seem to be a double door elevator.
Towards the end of the movie when the thug notices the other thug knocked out laying on the ground, you can see a small water spot on his right arm. But as the thug is picking up the unconscious one in the next shot you can see the water spot is substantially bigger on his arm.
After Ace rescues Dan from the warehouse in Hallandale, they are shown briefly driving on the Florida Turnpike. Hallandale is located north of the stadium, and therefore they would have had to travel south. In the film, they are traveling north on the highway.
The film mentions the 1985 Super Bowl as Super Bowl XVII." It was in fact Super Bowl XIX. Super Bowl XVII was held on 30 January 1983. While the Miami Dolphins lost both games, and the 1985 winner was correctly identified as the San Francisco 49ers, and Dan Marino played in the 1985 game, neither game's score was close enough for a missed field goal to matter.
At the end when the police run in to arrest Ace, Einhorn screams that he kidnapped Snowflake and was just about to kill Dan Marino and her. You would think that Dan Marino would have spoken up and disputed her at that point.
When the police run in to arrest Ace & Lt. Einhorn is saying that Ace kidnapped snowflake, she also mentions that he killed Roger Podacter. The problem there is that Melissa Robinson can back Ace up & clear him of murdering Roger Podacter because Ace was with Melissa at the time when he was murder.
After returning the Shih Tzu to its owner, Sexy Woman, she offers to "take Ace's pants off" as a reward. In the ensuing encounter, Ace swings above the camera frame line, revealing that his pants are still clearly on and buckled.
There are several spelling errors in the newspaper articles Ventura and Melissa view on microfilm, including "origionally", "Finkle'" with an apostrophe instead of a comma, "stiil", "itys" (its), "disasterous", and "Champioship". The articles also use the same filler material (usually when it's near the edge of the screen): a football-related paragraph once the relevant information is done, and occasionally completely unrelated copy that seems to have come from another article.
When Ace breaks into the storage room using the Private sign the type of jamb indicates it is an out-swing door yet the door swings in. You can see the jamb is in the way and the lock cannot be picked in the manner he did that in the shots before and after the close up of him breaking in.
At the end after Ace has ripped off Einhorn's skirt, Dan Marino is the one who points out what's obviously in the back of her underwear. However, the numerous police officers who are also directly behind Einhorn act as though they see nothing.
In the film that runs in Ray's room showing the missed field goal, the ball sails wide right (looking from behind the goal posts). When the camera cuts to the shot of the referee in the end zone, he gestures with his hands that the ball went wide left.
At the end during the "Super Bowl" once Ace brings Dan Marino to the game. After kissing Melissa, Ace looks over at the water coolers to see the pigeon up for the big reward. In the background of that shot you see a couple ushers including a bearded one. The next shot is back on Ace and Melissa and now the bearded usher is standing behind them.
In the end scene at the football match when Melissa and Ace start kissing their backs are to the audience in the football stands and Melissa is on Ace's right side. In the next shot she is to the left of him and they are now facing the audience in the stands and then in the next shot she is back on the right side. But there was definitely not enough time to change to these positions.
When Ace enters the storage room of the asylum and searches through Ray Finkle's box of belongings he picks up 2 knitted doilies that say "Die Dan" on them with the diamond shaped one being in his left hand and the octagonal one being in his right. In the very next shot they are reversed.
Although it is unclear if Ray Finkel/Lois Einhorn genuinely identifies as a woman or is a mentally ill cisgender man who has gone to great lengths to disguise himself as a woman (including top surgery and hormone therapy), any transgender woman can attest to the fact that there is no permanent physical way of altering one's voice through either surgery or hormones. Most transgender women undergo voice training to learn to speak in a more feminine register, but generally it is not their "natural" voice - meaning Einhorn is always "performing" her voice. After Einhorn has been found out, she becomes emotional and screams "Die, animal boy!" at Ace, but still continues to sound the exact same and not any different than she has throughout the film.