In the scene where Sam is talking with the person in the cemetery, while they are sitting side by side on a bench. In one shot there is an object on his left shoulder and it is missing in the next shot.
When Henry and Dabs are playing Fifa, Henry scores a header - an Xbox 360 logo can clearly be seen in the bottom right corner of the replay screen despite the fact the 2 are playing with PS3 controllers.
In the scene where Sam fights with a person in the cemetery. The fight scene shows sunlight and shadows in one shot and missing in another. This is repeated while they are wrestling each other on the ground.