Continuity mistake: After Jim Carrey crashes the car on the bridge and, we see in the long shots that the lamp on the half-broken post above him is swinging from side to side. However each time we cut to a closeup of Carrey's face, it is lit very evenly - although the only source of light nearby is swinging wildly.
Continuity mistake: When Pete awakes on the shore, the dog licking his face steps over his head, leaving footprints in the sand. In the following shots, however, the footprints have disappeared. (00:18:40)
Continuity mistake: When Jim Carrey's car goes into the water, it lands upside down. Then he is underwater and gets his coat off. The car is completely submerged at this point. When he comes up for air, the car is only halfway submerged with one of the ends sticking up perpendicular to the surface of the water.
Answer: Emmett was the only person that knew for sure. And he answers your question in the movie. "The town needed you to be Luke." He knew, but he did not want to rain on everyone's joy. Adele also eludes to the fact that she was pretty much fooling herself because she wanted to believe it. Bob also kept quiet for a similar reason to Emmett. He did not want to take away from the town's joy. Especially after so much loss and heartbreak everyone had been through. He was willing to put his dislike for Peter to the side for the time being.
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