During the chase scene you can hear a manual stick shift changing gears on the Mustang during exterior shots of the car, but shots inside the vehicle during the chase show an automatic and not a manual stick.
When Chalmers tells Bullit on Friday that he needs to keep Ross out of reach of the organization for 40 hours until the senate sub committee hearing on Monday, it should be 64 hours. 40 hours would put the sub committee hearing on Sunday.
Bullit thumps a newspaper stand to make it open and takes a paper, as he doesn't have the correct coin. However he then goes into a nearby shop, holding the paper, to buy some groceries. Surely he could have asked for an appropriate coin in his change which he could have then used to buy the newspaper.
After the man with grey hair is spotted in the hospital, the cops are alerted on the ground floor. One walks outside where it is quite dark. Later, Bullitt chases the man outside, where it is daylight.
When Bullitt continues pursuit of the Charger after spinning off into the dirt, you can hear him upshift once as he is driving away. In the next shot you can hear him upshift another three times. It is impossible to upshift any more than three times in total in a 4-speed transmission.
When Bullitt leaves the hospital, taking Ross' body to the morgue, he is still dressed in the clothes he wore when he responded to the shooting the night before: brown cardigan over a light blue shirt. Very next scene, when he pulls up and parks the Mustang, steals the newspaper, visits local grocery, he is now wearing the trench coat over the trademark green sport coat and blue turtleneck, BEFORE he goes home, showers and is seen changing into these very same clothes for the remainder of the film.
Bullit's Mustang hasn't got an exterior door mirror on the driver side (at around 55 mins) before the car chase. When he gets out of the taxi (at around 62 mins) the Mustang suddenly has an exterior door mirror on the driver side.
In the final scene, were Bullitt is washing his face and looking in the mirror, he is wearing the brown cardigan sweater from the day before at the hospital, not the blue turtleneck he had been wearing.
During the chase scene, when Bullitt first begins to ram the Charger, the passenger with the shotgun has just climbed part way into the back seat of the car to fire at Bullitt. However, in the first two distant shots of the two vehicles colliding, it appears the passenger is still properly seated in his seat.
When the Mustang makes its U-turn at the 66 station, Bullitt yields to a 66 Plymouth Fury, which becomes a late 50's Ford Victoria. With the same scene change, the time of day switches from late afternoon to mid-morning (see the shadows).
During the chase scene, when we see the interior of the Dodge car with the two passengers inside, the rearview mirror shows the face of the passenger riding shotgun. This means that the mirror is tilted to the right, making it impossible for the driver to see who comes from behind, like he does so often.
When the bad guys in the Charger have lost the Mustang, they look to the left and see a small red car (Fiat) on top of the hill with no car parked directly in front of it. Five seconds later a 1958 Dodge appears parked right in the front of the red car.
After Dorothy Simmons Renick's body is discovered by Lt. Frank Bullitt and subsequently witnessed by Cathy, there is a shot of Cathy's yellow Porsche Speedster taking an off ramp, preceded by a light blue early-1960s Pontiac (Tempest or LeMans). A few minutes later, after Cathy and Lt. Frank Bullitt's conversation by the water, the same shot is shown again except it is slightly earlier in the sequence, when the blue Pontiac is just starting to pull into the off ramp, and Cathy's yellow Porsche is still in traffic, just barely visible about 7 vehicles behind the Pontiac and right behind an old white Ford Econoline van.
When the guys in the Charger first lose sight of Bullitt as they stop to make a left uphill curving turn, there is a green Ford Falcon parked on their left, this car is replaced with a red and white Chevrolet circa 55 or 56 that was parked further away.
Several motions made by Phil (the driver of the Charger) suggest that the car is a manual, and what appears to be a shifter's sleeve is briefly visible after Mike loads his shotgun. As the charger approaches the truck that it later sideswipes, you can hear a down shift, and Phil's hand does not leave the steering wheel.
Albert Edward Renick unhooks the chain on the door wearing no jacket, seconds later Carl Stanton is shot and he is shown backing onto the bed wearing a suit jacket but half off. After Renick is shot the jacket once again disappears.
(at around 78 minutes) Cathy enters the room and sees the dead body of the lookalike's wife. The room is full of policemen. The next scene is a close shot of the dead body, the room is empty now and even Cathy has disappeared from the door where she stood before. In the next scene Cathy and the policemen are back again.
During the chase between the Mustang and the Charger, just after the Charger side-swipes the truck and hits the fence, the old man reaches back to roll down the driver-side quarter window. At this point, the sides and doors are rather damaged, yet the two cars do not make contact until a few seconds later.
In Airport chase Bullit is carrying a .45 caliber automatic down by his side while Renick displays a revolver beneath his jacket. In the following shoot-out Bullit shoots Renick with the revolver while Renick falls through the glass doors, dropping the .45 automatic.
When Carl Stanton is driving the 1967 Ford Custom to the meeting at Walter Chalmers, he is preceded by a 1950's Nash and then when the policeman directing traffic in the next shot appears the 1967 Ford Custom is then preceded by a 1967 Buick Skylark station wagon.
During the pursuit through the airport, Bullitt wears a trench coat, jacket, and blue shirt. At the end, when he gets closer to his apartment, he's still wearing the trench coat and the jacket is in his hand. Inside the apartment he is wearing a brown cardigan over the shirt and the trench coat is in his hand.
The address of the hotel where Johnny Ross is killed is twice given as 226 Embarcadero Road. The address is real, but the correct name of the thoroughfare on which it is located is The Embarcadero, not Embarcadero Road.
When Bullit calls Sgt. Delgetti from the restaurant,the call goes through direct to the hotel room. This hotel had an old switchboard and all calls in and out had to go through the hotel operator to get connected.
On the sign outside the hotel where Bisset drops off McQueen, it says, Mother's Day Brunch May 11th. In 1968, Mother's Day was May 12. Since Mother's Day did indeed fall on May 11th the following year, 1969, this may have been a deliberate error in anticipation of the film not being released until 1969.
When Bullitt goes back to the scene of the shooting, he looks at a crime scene diagram, and two police photos of Ross/Renick in the position he landed in when shot, taped on the wall. Since the ambulance would have gotten there before the crime scene technicians, and Ross/Renick was still alive and removed quickly in an ambulance, they wouldn't have been able to take what look like crime scene photos of a body.
When the detective in the hotel with Ross calls Bullitt at 1:00am, Bullitt says he will be there in 5 minutes. Yet when he gets there multiple police, ambulances, and detective Delgetti are already there.
The newspaper Delgetti is reading at Frank Bullitt's flat on late Saturday morning (a Warner Brothers print prop) is the same one as he buys (borrows) supposedly on Sunday morning after the ambulance trip to the morgue, the next day with the same headline i.e. "A PEACE TALK FLURRY".
Despite claims nothing was "sped up" in the filming, during the chase the Charger makes a 90 degree right turn whose radius of curvature was about 65 or 70 ft ~ 20 m, in about one second, as if it were a Formula I car. To do so would mean the car pulled about 4.5 g which is far beyond even the modern version of the Charger (.85 g), especially on bias-belted wide oval 70 series tires. Centrifugal force = radius * angular velocity (90 deg=2*pi/4), squared, or 20*(2*3.14/4)^2.
At one point during the chase scene, the black Charger produces a fresh skid mark and subsequently crashes into a parked car, moving it slightly to the side. A split-second later the skid mark and the Charger disappear and the parked car is back in place. The weird editing was due to the Charger smashing the camera, as shown in behind-the-scenes footage.
When Ross fires two shots at a policeman while trying to escape from the airport, he fires two shots about half a second apart. However, two bullet holes appear simultaneously when the first shot is fired.
In several areas throughout the chase scene, pre-existing tire marks are seen before the two vehicles pass by. This is a common revealing mistake in scenes that involve practice takes before the actual scene is shot.