Visible crew/equipment: When Angel is chasing the shoplifter, look in the car's bodywork and you can see the camera's reflection. (It's a black rectangle that moves along the cars body work). You have to look extremely carefully, and slow-mo may help but is NOT essential. (00:27:45)
Visible crew/equipment: After Leslie Tiller is stabbed with the garden shears, when Nicholas chases after the hooded figure, just as he dives over a table with potted plants the blue crash mat is visible under the table. (Slow motion is not necessary.) (01:07:00)
Visible crew/equipment: When Angel is in the Volkswagan and going back to Sandford, there is a closeup of Angel. In his sunglasses you can see the camera clear as day. (01:26:20)
Visible crew/equipment: When Angel stands after being shot in his bulletproof vest, the entire crew is reflected in his sunglasses. Most obvious is the boom operator with his microphone.
Visible crew/equipment: When the police are storming the local Somerfield shop, after pushing the trolleys into the butchers, they are attacked by others of the shops staff who are throwing fruit. In one close up shot of the fruit being thrown if you look carefully at the pineapple as it's in the air there is a white part on the bottom. This suggests that the fruit being thrown are actually plastic. Slow motion is useful to see this but not required.
Visible crew/equipment: After Frank shoots the light thing on the ceiling and he gets away, just about when Nicholas says "He'll come round" and the camera is aiming down where Frank got away, look at the bottom half on the screen and you can see someone's/something's shadow moving.
Chosen answer: In the pub Danny demonstrates using a ketchup packet to simulate stabbing himself in the eye. Later in the film he returns Nicholas Angel's notebook, hiding a ketchup packet in it. He stabs the pocket with the notebook, causing the ketchup to leak and simulate blood.