Continuity: When John is in his Manhattan apartment reminiscing, we see his daughter throw a ball at him. If you take a close look at the ball, you will see how beat up it is. However, when the ball is falling down the stairs in his rented house for the first time, it has become new and shiny.
Revealing: In the beginning, when the main character's wife and daughter are killed, being accidentally run over by the truck, you can see in the wide shots that there is no blood, no bodies, nor any sign at all that they were hit. They simply disappear in the shots where the truck supposedly hits them. Obviously done for the sake of safety, but still a pretty blatant mistake.
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