Continuity mistake: During the chase, we see that there are only three cops (we see a head-on shot of the three cops with an empty sidewalk behind them), but when Mr. Pink opens the car door and starts firing in the direction of the cops, the first three cops (the thin ones) scramble back around the corner. Just then, a fourth cop (the fat one) pops around the corner from nowhere and gets shot.
Continuity mistake: During Mr. Pink's flashback, he's chased by three cops across the sidewalk of a long, straight avenue - apparently, they all pass the same exact spot numerous times. Notice the white van parking next to the sidewalk as the policemen run next to it - it is followed by a yellow truck. Look closely beneath it, and you'll spot a place where the sidewalk mixes with the road. Later on, in the wide shot of Mr. Pink running, he passes next to the same exact white van, and the same spot where the road mixes with the sidewalk is visible just next to it, right as he picks up the briefcase behind it, yet the yellow truck is gone. Since the cops are behind him, that place should be far away, as he's been running along a long avenue. [To make the street look longer, the filmmakers shot the chase a few more time on the same short street to make it look like a long avenue. Yet the white van marks the same spot, and thus it is a mistake.].
Continuity mistake: After the climactic shootout near the end of the movie, Mr. White falls on his elbows, facing Eddie's body. In the next shot, Mr. Pink leaves. When he is leaving, Mr. White is facing the back of the warehouse, where Mr. Pink hid. That is a near 45 degree turn when Mr. White was in both shots.
Continuity mistake: In a scene near the end, Joe arrives at the warehouse and tells everyone that Orange is the informer. We frequently see Orange on the floor, however the blood patch he is lying in changes from wet to dried to very wet to larger and smaller and back and forth. Also sometimes there are bullet casings around him or the magazine he dropped depending on the shot.
Continuity mistake: When Mr. White is trying to calm Mr. Orange in the warehouse White pulls out a comb and uses it on Orange then goes to put it in his pocket, but lays it on Orange's chest and never picks it back up. In the next sequence when talking to Mr.Pink, White washes his hands and face, puts some water in his hair, pulls a comb out of his pocket and uses it. (00:13:05)
Continuity mistake: When Mr. Pink and Mr. White reflect on Mr. Blonde's madman behavior during the robbery, Mr. White says "I came this close to taking him out." A few minutes later, that line is unintentionally attributed to Mr. Pink. It happens just after Mr. Blonde arrives at the warehouse with his soda, when he and Mr. White nearly get into a fistfight. As Mr. Pink moves to stop the fight, Mr, White says something to the effect of, "Now you're taking his side?" a few minutes ago, you said you thought about taking him out." An incredulous Mr. Blonde says "You said that?" Mr. Pink admits that he did, even though he didn't, but now maintains that Mr. Blonde is the only one he can trust: "He's too homicidal to be working with the cops." This mistake is caused by QT changing the original script (where the "I came this close" - line was originally for Mr. Pink) but forgetting to also alter the later reference.
Continuity mistake: During Mr. Pink's flashback, He shoots the four cops hiding behind the corner while jacking the car. When looking from Mr. Pink's point of view, you can see that the fat cop gets shot and leans on the ground, yet when we see this from the policemen's point of view, the fat cop isn't injured and fires without a problem, when suddenly he gets shot.