Crossroads - S1-E8
Continuity mistake: During the hiking trip when Parker is about to lead the group, Claire's water-bottle disappears then reappears from her hand as she's adjusting her backpack.
Crossroads - S1-E8
Continuity mistake: When the dance teacher is asking David out, the strap of the courier bag over the teacher's shoulders keeps vanishing and reappearing between shots.
Chosen answer: It is strongly implied that Lisa was murdered by her brother-in-law Hoyt, with whom she had been having an affair. When Nate confronts Hoyt about Lisa's disappearance, Hoyt shoots himself dead before the question is finally resolved.
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