Corrected entry: SPOILER: In the flashback of Scanlon killing Britt's father, it is nighttime when he kills him. But Britt's father died the same day as when Britt woke up with the hot girl after the party. When Britt sees the news report about his father's death, it's daytime the same day. There was no time for Scanlon to wait till nighttime to kill him.
Brad
23rd Jan 2011
Correction: The flashback was shot in black and white with an angle from the top. With ample light in the scene there is not enough clues to imply that he killed his father at night. Your confusion is understandable.
You must have watched a different movie. The scene wasn't shot in black and white or from an angle from the top. The car in the background at James Reid's house has its lights on to indicate it's night.
Bishop73