Plot hole: Just after Rita rescues Jeff, Diane's grave is seen close to where Jeff was buried alive. Even though Diane's been dead for several years, her make-shift grave site looks like it was freshly dug. There are no fallen leaves or other debris on top, no new vegetation (moss, grass, weeds, etc.) of any type growing on it, nor has the mound of dirt settled, shifted, or been affected by the weather.
The Vanishing (1993)
1 plot hole - chronological order
Directed by: George Sluizer
Starring: Jeff Bridges, Kiefer Sutherland, Sandra Bullock, Nancy Travis
Continuity mistake: When Rita is being held by Barney in the cabin, she wipes the mud from her face with a white towel. In subsequent shots, her face goes from completely clean to streaked with smears of mud.
Cop at Gas Station: Had you had a fight recently?
Jeff Harriman: Not a fight, a thing.
Cop at Gas Station: ...A thing?
Jeff Harriman: Yeah, a thing, don't you have a girlfriend?
Cop at Gas Station: Yeah. And what you think is a thing, you can bet your life she thinks is a fight.
Question: Why is there someone (looks like a policeman) lying in the road when Jeff's girlfriend, Diane, vanishes from the service station? (00:22:00 - 00:24:00)
Answer: He is a crew member lying in the road directly behind the brown G.R.S. Dye Works semi-truck (presumably trying to remain hidden from the camera's view), and we even see his right hand waving off the traffic ahead of him (00:22:05).