In the Zola Budd flashback scene the young Ben in shown watching the 1984 Olympics. This puts the year of Ben's birth in the mid to late 1970s which would make him late twenties/early thirties in the present, but the adult Ben is clearly portrayed as an undergraduate student of about twenty. The ages would be correct if the main body of the film was set in the mid 1990s but to accept that would involve too many anachronisms (references to texting, Sainsburys uniforms, cars in the car park, etc.).
In the scene where Ben takes his manager away in a cart you can see that manager blinks in the last moment, that should not be possible because time is standing still.
When Sharon takes a bite of Ben's sandwich in the locker room, the bit of food is on her right cheek when she is seen from the front, but gone when she is viewed from her rear right.
Ben Willis: I could feel a faint shift in a faraway place. A current of unknown consequences was on its way, moving towards me like an unstoppable wave of fate.
Ben Willis: Within this frozen world I'm able to walk freely and unnoticed. Nobody would even know that time has stopped. And when it started back up again, the invisible join would be seamless except for a slight shudder. Not unlike the feeling of somebody walking over your grave.