The Jag at the start of the movie has an "R" registration plate. When they torch the car, it is now an "N" registered car.
In the immediate scenes leading up to the diamond heist Mickey's are sporting roses in their lapels and shirts. As the two gangs start to fight underground it's clear they no longer are wearing their roses.
When meeting with Trenchard (38:00), Big Ben is chiming the hour, however the clock face clearly shows 5:55pm.