Other things...
1. The events of SH2 take place 3 days after Mary's death, not 3 years. Laura hints this at one point.
2. I forget where it's hinted, but it's very likely that Mary's body is in the trunk of James' car.
3. If you haven't watched the other endings, I would strongly recommend it, specifically the 'In Water' and 'Maria' endings.
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Black Turtle did a pretty good job.