Federal prison sentences are given in months, not years. A sitting federal judge would know that and would never made a mistake about it. Also, parole is only possible in the federal penal system after 85% of the sentence has been served, making it impossible for a 25 year sentence to end in parole after 5 years. However, Edgar Wright was questioned about this, and has admitted that there is some deliberate, ambiguous wish-fulfillment fantasy about the ending, and allows that it might be the dream of an about-to-be-executed Baby.
In the opening heist, the getaway involves dumping the original car and switching to another. However, while Buddy, Darling and Griff all wear gloves, Baby does not. During his "dance" scene he touches, and leaves fingerprints on, the steering wheel, wiper control, the outside of the door, and a water bottle (which he leaves in the car). During the getaway he also would have left prints on the gearshift and the interior door handle. However, Baby has most likely never been printed therefore his prints would not be in any police records whereas all other heisters indicate they do have criminal records and could be implicated if their prints are found. This is also why Baby is asked to case the post office - he presumably has no criminal record.
During the course of the film, Baby frequently has music playing in his ears in order to drown out the tinnitus (ringing in ear) he suffers. However, most ear specialists recommend people with tinnitus to limit being around loud noises, which would include playing music via earbuds; Baby might being inflicting more damage to his hearing. However, he is also participating in armed robberies, which is not a recommended as a healthy cure either.
When Baby is breaking into a car after being chased through the shopping mall, a camera operator can vaguely be seen in the reflection.
At one point, Buddy refers to a "disabled parking spot". Almost all Americans would call it a handicap spot, while 'disabled' is used in the UK. The mistake is likely due to Edgar Wright, the screenwriter, being British.
While planning for the armored car heist, Baby notes that Doc instructed them not to buy their Halloween masks at the same time (to prevent suspicion), yet when they get to the heist JD appears to have picked up all three of the (incorrect) Halloween masks. However, they could easily have ignored the advice as being overprotective or unnecessary.
In the opening car chase sequence, several of the second unit stunt car shots show the driver as the only person in the car where there should be four occupants.
Murder, in most cases, is not a federal crime. So while Baby might not be charged by a federal court, he would face charges under Georgia law for any deaths that occurred during the commission of felony crimes. This would mean the death penalty for him given the numbers and severity of the crimes involved. He would never get out of prison and he probably would be executed. However, Edgar Wright was questioned about this, and has admitted that there is some deliberate, ambiguous wish-fulfillment fantasy about the ending, and allows that it might be the dream of an about-to-be-executed Baby.
Eiza González's character Darling is shot in the right arm. Then five minutes later she's eating in a diner and her right arm doesn't have any blood on it and her jacked has no hole in it where she was just shot.
When Bats, Buddy, Darling, and Baby go to the diner and order 4 Cokes, the sound of the ice clinking is ice in a glass cup but the cups are plastic.
While waiting in the Subaru, Baby flips the wiper switch down to turn it off. In a Subaru and most Japanese imports, UP is off.
Oddly, none of the main characters seem to be too worried about leaving DNA samples at or near crime scenes or in getaway vehicles. This includes Doc, a purported criminal mastermind.
During Doc's final shootout in the parking garage he fires the shotgun at least 8 times without reloading when that type of shotgun will not hold that many shells without a reload.
During the planning of the second heist, Doc mentions the bank is in Dunwoody, GA, at the top of the "Perimeter" (I-285), and that a possible getaway road is the Buford Highway. Later, Baby and the getaway crew are seen driving south on I-75/85 in downtown Atlanta. None of these highways or locations are anywhere near each other.
During the gun battle with police near the end, Buddy's fully automatic M16 can be clearly seen expending multiple brass casings indicating fully automatic fire. Twice during the battle the sound edit only makes semi-automatic fire (single shot).
When leaving the postal centre they shoot the security guard and in the rush leave their identity masking glasses on, however buddy's glasses are turned off in one cut.
The camera crane is reflected in some shots of the second chase, especially when the gang vacate their vehicle in the middle of traffic.
(around 6 min.) When Baby and his gang switch from their red car into a green car, the cameraman and a crew member are reflected on the passenger's door upon swinging open.
(around 27 min.) As Baby and his gang drive off from their second heist, the camera is momentarily reflected on the Avalanche vehicle. Likewise, the camera crane is reflected on the blue truck - seconds later - as it tries to mow down the gang.
(around 1 hr and 26 min.) When Baby heists an old lady's Chevrolet, the cameraman is briefly reflected on the car's windows.
During the post office robbery it is raining hard. When the getaway started, the sun was shining bright. However, the weather could have changed over time.
Doc asks Baby to go inside the Post Office and take note of cameras, registers open, etc. Sam tells Baby there are "ten cameras, THREE registers open, etc." Baby returns to the car and tells Doc there are "ten cameras, TWO registers open, etc. " However, Baby didn't do such work before and thus could forget details, or may have intentionally lied.
In the garage shoot-out/ram-out, Buddy empties the magazine in his Sig P228 through the police car windshield. The pistol then "clicks" 2 or 3 times. Empty semi-auto pistols don't do that.
In the opening car scene, Baby drives a red Subaru between two supposedly identical cars, but several shots of the decoy vehicles (from ground level) reveal VW insignia and a Chevy badge, making it clear the cars are only similar, not identical.
Just before dropping Baby off, Doc turns right on a red light without stopping, and while the crosswalk signal is displaying a "walk" sign. Although one could argue that he is a criminal and is comfortable breaking the law, a criminal mastermind who plans heists knows how not to get caught and would never break two traffic laws in full view of the public (and risk being pulled over).
Buddy cruises through the parking garage looking for Baby, calling out "wherefore art thou, Romeo?" (Wherefore means why and not where.)
Camera reflections and shadows are visible in some shots of the first chase.
As lyrics are displayed in signs and graffiti in the opening sequence, the word "whoa" is misspelled as "woah".
When Baby is having flashbacks to when he was a kid and his parents were still alive, he can be seen as a child sleeping in bed listening to music through apple Earpods. However, Earpods were first introduced in 2012 and wouldn't have been around when he was that young.