The picture of Bianca that Michael finds in Harley's house changes. The first time it is shown she is looking up, the second time she's looking down. Further more, it was made in the scene where she meets Cooper at the retreat, which happened just moments before Michael found the picture and after Harley had already been killed.
(at around 24min) KITT stops at the side of the Road is played backwards. You can notice it when you pay attention to the dust. The same shot is used later at min. 27 when KITT reverses but then its played forwards.