After Ashley's father is murdered, he is seen to be still breathing.
Ashley used time release capsules to put the deadly dose into, to kill her father. He died within just seconds after he took them.
When Mark is looking at the deceased's Powerbook computer, the "File Directory" is a non standard format not used in any version of the Mac OS. They apparently used a fake screen to make it easier for the audience to read.
When Mark is browsing Amanda's father's Apple PowerBook, DOS-style noises can be heard. And the clock is set to 0:00:00.