Corrected entry: I'm not sure what type of mistake you would count this as, but there's no way a policeman/authority of any kind would come to someone's home, tell them their husband has died, and then just leave, giving them a calling card. Even if not to comfort her, there would be formal identifying or other official arrangements to be made.
Corrected entry: The daughter runs through the right right hand pane of glass, but when her father sweeps up, the broken pane is on the left.
Corrected entry: When the Doctor injects Linda with the drug, it's very obviously her upper right arm near the shoulder. But later when she wakes up in her own home, and frantically checks her arms to see if there are injection marks (meaning did it actually happen), she only pulls her sleeves up just above both elbows. She looks for needle marks only up to her elbows and just above, which was far below where the actual injection took place. Since she remembered the incident, she would have remembered where the shot was given.
Corrected entry: Sandra Bullock is watching as her husband gets killed in the accident at the end of the movie, and the accident takes place on Wednesday. But at the beginning of the movie, a cop informs her that her husband is dead, and it's supposed to be Thursday. If she was there when it happened, why would he be telling her about her husband's death one day later?