After injecting Hawk's leg, the syringe the Almond Joy removes is just as full as when she started.
As Hawk is riding the gurney behind the ambulance, the plastic IV bag on the gurney gets shot (mind the mismatched sound, see other goofs). but in a subsequent shot, the IV bag is intact again.
As Hudson is speaking with Anna on the couch, her dress jumps back onto her shoulder between shots.
When the Mario Brothers are chasing Hudson Hawk in the ambulance on the Brooklyn Bridge, the air fresheners hanging from the rearview mirror and the needles hanging from Antony Mario's face change.
After Hawk is confronted by George Kaplan, his notebook is lifted by the henchwoman. She reads the list of items including 100 stamps. The next scene has Hawk riding the mail train to the Vatican. Ignoring the visible stamps on the side of the carton, there are at least 209 stamps on the top of the same carton.
Hudson Hawk is given a brick of gold and a brick of lead while blindfolded, to demonstrate that they are indistinguishable by weight. Gold is 70% denser than lead, and the weight difference would be easily noticed. The gold brick would weigh about 30 pounds, but they handle it as if it weighs a couple of pounds. They also mention that gold and lead differ by one proton on the periodic table of elements. The difference is actually 3 protons and 7 neutrons.
When Eddie and Tommy are in the recorder room of the auction house, Tommy tells Eddie that they have about "5 minutes and change." Eddie says "5:32 - Swinging on a Star." The version of the song that they sing as they are robbing the auction house is (at best) only 2 minutes 36 seconds (less than half of the time for which they have planned).
Da Vinci's clay model of the Sforza was destroyed by French soldiers invading Milan in 1499.
The lock picks Hawk uses on the door are two picks, you use a pick and tension bar, and it's inserted in a way no lock picker would.
Minerva Mayflower incorrectly states that Gold (Au) and Lead (Pb) are but one proton apart. Gold, atomic number 79 and Lead, atomic number 82 are 3 protons apart.
When Tommy and Eddie jump from the museum/auction house, the
cables attached to their stuntmen were visible for a second.
When Hudson Hawk fires the tennis ball at Bunny the dog, the metal tripod holding the dog puppet up briefly flashes on screen when the ball hits it.
Hawk uses the swimming pool rope to climb between buildings. The rope is secured by a Styrofoam life ring incapable of supporting any weight.
Any 500-year-old book would fall apart when treated as cavalierly as Hawk treats Da Vinci's notebook.
When Hudson Hawk is being dragged behind the ambulance on the gurney, Cesar Mario shoots at him hitting the IV bag. The IV bag is plastic but the sound effect is that of glass shattering.
Hudson Hawk is pulled along the Brooklyn Bridge by an ambulance. When he breaks free, he exits the bridge in the left lane. He ends up at the toll plaza for the Brooklyn Battery tunnel, which is about three miles away.
When Eddie and Tommy rob the auction house, they make no attempt to hide their fingerprints, for instance, by wearing gloves. Since Eddie is just getting out of prison, his prints are on file and he would be their prime suspect.
When Tommy is quizzing Hudson Hawk on song lengths, he asks "National Anthem, Whitney Houston, Super Bowl 17?" Whitney Houston sang the National Anthem at Super Bowl 25. Leslie Easterbrook, who played Callahan in the "Police Academy" movies, sang the National Anthem at Super Bowl 17. Also the Whitney Houston version was 116 seconds not "7 minutes 17 seconds" as Hudson claims.
During the auction, when Leonardo Da Vinci's horse sculpture is brought out, there is no way that the person carrying such an object would not be wearing gloves.
When Anna is in the confessional, the priest forgets to give her absolution at the end of her confession, though he gives her penance.
During the auction, when "Leonardo's" horse sculpture is brought out, there is not way that the person carrying such an object would not be wearing gloves.