When Ray & Danny pick up the taxi they back into the Pontiac's left rear with their right rear corner. However, subsequent scenes show damage only on the taxi's right front fender. Additionally, when the drug dealer repeatedly fires into the right side of their bullet-proofed taxi there is no damage whatsoever. There would be paint damage, metal dents and some spider-web cracks in the glass wherever bullets struck the car.
In the ladies' room, the lawyer for Aunt Rose's estate throws his business card into the sink. When Ray picks it up, it is on top of the sink.
The red 1969 Mustang is splashed with snow on the drivers side when it swerves to miss the delivery truck. As it crashes in a following scene, the drivers side is clear of snow.
When Danny drives Julio's Mercedes from the impound lot, it has an obvious rear-view mirror on the windshield. In the close-up of Danny and Ray in the vehicle afterwards, the mirror is not there. In subsequent shots, the mirror is sometimes there and sometimes not there.
When Julio's Mercedes is towed to the police impound it does not have hubcaps. When Billy Crystal's character picks it up at the lot it has Mercedes logo hubcaps on the car.
After Hughes and Costanzo call for backup, the police car they enter has "Chicao Police" misspelled on the doors.
Chicagoans stand "in line" not "on line" as Costanzo said to his Aunt Sophie at the funeral.
In the opening scene, Hines and Crystal are in a Chicago park at Christmastime. All of the trees in the park are loaded with green leaves - not something you'll ever see in Chicago in December.
The film takes place around the Christmas season, as suggested by the 'snow' seen in all of the street scenes. However, it is painfully obvious the snow is nothing more than soap bubbles that has been haphazardly blown across the street, vehicles, and various structures. The most glaring example of this 'fake snow' effect is when the two lead actors go to Aunt Rose's funeral. The trees and headstones look like they've suffered a bubble bath fight, rather than a typical Chicago snowstorm.
Lack of motion blur during the car chase on the El reveals that it was filmed with the vehicles moving slowly and then sped up to give the appearance of a chase.
When chasing Smits they first drive on commuter railroad tracks at the 43 min mark. When they enter the tunnel they are suddenly on an El line even though there is no apparent third rail. The third rail appears as they exit the tunnel.
During the chase through Chicago, Ray Hughes is moving his hand on the steering wheel but the wheel itself does not move.
Patti LaBelle's name is misspelled ("Pattie") in the closing credits.
At the start of the Limo chase, as the limo pulls away from the airport a white Ford Mustang pulls out in front of it (as seen from the limo.) The next shot shows the Limo strike a white Plymouth Horizon.
The cast list in the closing credits misspells "subpoena," "tattoo" and "Colombian" and mistakenly omits the "s" in "Customs Official."
When Costanzo and Hughes are driving around in Julio's BMW, they stop by the playground to shoot hoops with the same hostile group of guys they played against in the beginning (When Costanzo got punched by the large man). However, in the wide shot, when Hughes makes his basket, one of the extras in the supposedly hostile group raises his arms in triumph celebrating the basket.
When Ray jumps down from the top of the garbage truck after shooting through its windshield from above, we clearly hear the sound of his gun hitting the ground, but when he pops back up to approach the truck from the front, the gun is in his hand.
When the limo carrying Gonzalez is hit by the El and flipped upside down, the two cylindrical housings for the pyrotechnic effects are clearly visible on the belly of the car.
When on the red scooters in Key West they are driving in the wrong direction as they pass Key West by the Sea condominiums on S. Roosevelt Blvd.
When Gregory Hines and Billy Crystal are discussing their shooting accuracy at the get away vehicle with the men who tried to rob them after they first arrest Snake, Hines' character says he hit the windshield with all six shots. However, there are only 5 bullet holes in the windshield.
They were both bragging and trying to one-up each other, not giving the shooting match score.
They were both bragging and trying to one-up each other, not giving the shooting match score.
Aunt Sophie says to Costanzo "Italians don't get divorced, it's a sin, they're just not together". Italian isn't a religion, it's a nationality. So she should have said, "Catholics don't get divorced, it's a sin". Unless she was trying to imply that all Italians are Catholic. Even if she had said "Catholic" it still would have been a mistake, as it is NOT a sin to get divorced in the Catholic belief, it's only a sin to get remarried.
Costanza says Key West is as far South as they could get without having to speak Spanish, but the northernmost Hawaiian island is 11° farther South than the southernmost point of Key West.
Maybe so, but Spanish isn't as necessary in Hawaii.
Maybe so, but Spanish isn't as necessary in Hawaii.
It makes no sense to put a scope on an Uzi sub-machine gun.