Possible proof it was a dream.
I just watched this movie for the first time and was pretty confused by the ending so I came here to read up. I'm torn as to whether or not he was dreaming or imagining. The first big clue I noticed that shows it was a dream was at the end when the dog jumps onto Sam and they both go falling into the water. When this happens, they look to have fell a good 10-15 feet. Afterwards, when Jake was talking to Holly, the camera was facing down on them and pulled away to reveal the water again, this time almost over-flowing. Surprised no one mentioned this.
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