Wah's facial bruises shift tremendously near the final scene from the time he got on the bus to the time he met Fly.
Wah and Ngor knock over the ice bucket yet in the following close-up the bucket stands up with water and ice in it.
In a scene Wah incidentally encountered Mabel which was supposed to rain heavily, there were many people across the street seen walking nonchalantly, suggesting that the rain was in fact a custom set.