Revealing mistake: When Frigga shoots a client in his house you can see the outline of the fake blood packets under his shirt.
Continuity mistake: As the two gorillas watch the approaching humans, one gorilla raises the telescope, then after the angle change, raises it again.
Continuity mistake: Some scenes show the actresses in their yellow prison dresses getting dirty, yet a minute or so after this, they're clean again.
Continuity mistake: When Ray and Alex incapacitate the last of the 4 cops, he flips on the ground wearing his hat. When they approach him to finish him off, his hat is at distance. (00:10:00)
Visible crew/equipment: When the camera zooms in on Sebastian as he is suspended dead by the snake charmer's rope, a visible wire can be seen suspending him in the air. (00:47:25)
Continuity mistake: During the opening credits, the marching band pass the Queen Victoria statue in Windsor twice on their way to the castle.
Continuity mistake: When the prisoners in the confinement holes talk clinging from the bars at the top, Jim Brown's hands are one bar apart in the overhead shot, 2 bars in close-ups. (00:00:50)
Continuity mistake: For the infamous closing scene, a van of drug-runners fire a double-barrelled 12-gauge shotgun straight into the windscreen of Officer Wintergreen's Electra Glide motorcycle, killing him. In the full front view, the gunfire virtually explodes the windscreen, shattering it on all sides all the way to the frame. Camera cuts to a side view and we see Wintergreen topple off as the motorcycle keeps traveling down the road. In this profile shot, the windscreen is no longer exploded, but now has a neat 4-inch hole in it.
Revealing mistake: When The Kid sits next to Dillon at the Bruins game, there are two older women in the background looking directly at the camera and pointing at it, having just noticed that they are being filmed. (01:33:10)
Other mistake: Throughout the whole scene when Black Caesar is wounded by the Irish hitman several passers-by can be seen looking directly into the camera, and in many shots people are crowded together on the sidewalk watching the filming. Conversely, the hitman fires a big and loud revolver in the middle of a crossing with dozens of people and cars in close quarters, and nobody bats an eyelid. (00:03:00)