The first time Stanley is shown on screen his hair is gray and white all over. The next time Stanley is shown in the police station his hair is brown with gray only visible on his temples. In other scenes of the film his hair changes color from gray/white to brown with graying at the temples.
The times on all of the clocks in the back-up T.V. studio change freqeuently between shots.
When Stanley meets the actress in the restaurant and the restaurant is attacked, he draws his gun (a six-shooter) and shoots back, but he shoots far more often than six times without ever reloading.
Clock in the background of the backup TV studio.
Outside Stanley White's house when he is shooting at the escaping gangster, his fellow officer is running towards him down the street with the shotgun. When they cut to White again this same officer is now in the front yard with White and they both jump over the fence.
After Connie is killed in the bathroom and Kearney and Lou enter Stanley's house to serve him papers, we see the outline of Connie's body with fresh blood on the bathroom floor. Blood turns a darker/brownish color after it is exposed to air, especially the time it took after Connie's murder and the beginning of this scene.
There is a reflection of a crew member moving his arm visible on the glass of the door Connie stands next to while Stanley and she discuss ending their marriage.
When Connie is in the bathroom before she is killed by intruders, there are 2 red spots on the lens, one on the right and one on the left. These are probably from a previous shot where fake blood got splattered on the camera lens and the operator failed to notice it.
Scene in Stanley's kitchen, where the sink pipe bursts and water spouts on Stanley - water also gets on the camera lens.
Reflected off the glass of the paintings in the bank.
At 14:19, when Joey Tai tells Stanley White the story of his stabbing, one can see the reflection of a boom mic on the frame behind him.