During the riot scene, a Volvo hatchback is torched using a petrol bomb. Later in the sequence the car is seen again, and the fire has gone out. It is possible, although unlikely, that the petrol did not ignite the interior (accelerants in isolation do not burn for long), but the car body shows no oxidation or paint damage, even around the roof.
Just before Sid the pub owner is killed, there's a change of camera angle in which at least one laser gun-sight dot instantly moves its position (to where a squib is hidden in the actor's clothing).
Although supposedly set in south London, most of the graffiti on the estate has been lifted straight from the New York underground scene by the movies art department, with internationally recognized American Graffiti artists such as 'Kez' and 'Skuf' and 'YKK crew' adorning the supposedly British sink estate.
Stretch: [encouraging Brown to rape the unconscious girl on his couch]
She likes to cuddle, this one. Wanna cuddle her? Do what you fucking want to her. She won't remember a thing!