Visible crew/equipment: Early in the movie when Robin Williams drives towards the tunnel where the accident happens, you can clearly see the shadow of the camera crane on the left side.
Continuity mistake: In the scene where Chris takes the temperature of a sick Marie, in the very first shot look closely at Marie's forehead. In the next shot and throughout the remainder of the scene, sweat covers her entire forehead. Many of the beads are large and are absolutely missing in the first shot. (00:42:00)
Continuity mistake: When Chris first arrives in his heaven he squeezes a blue flower and blue paint oozes within his fist, between his fingers and some gets to the back of his hand. Additionally, there is a mark of blue paint on his nose and some green paint on the back of his coat. Some of the paint from his hands transfers to his dog, Katie, when he pets her, then he jumps up and runs to the edge of the hill where he spreads his arms out from his sides in joy and laughs. We see green paint remains on his coat, but his hands and nose are now clean. (00:27:10)
Continuity mistake: After Chris is dead, and his wife is writing in her diary, and she writes "I still exist" as she's writing it, exist is written "EXST", then when she looks to read what she wrote it reads "EXT". The writing's different too. (00:22:10)
Continuity mistake: When Robin Williams and Anabella Sciorra are getting married, they are walking down the aisle and she trips. There is a close up a little before and a little after and it is obvious that her veil is different. Before she trips there is a fold in the veil and in the next shot it is nice and smooth.
Continuity mistake: Chris is telling Annie that he spoke to Cindy on the phone. Right after he says she's a soul-less bitch Annie wipes her nose with her left hand(notice her ring), then from the other angle she is using her right hand to wipe her nose.
Continuity mistake: In the scenes where Robin Williams is talking to his son in the rain, against the big tree, the boy's hair keeps changing position.
Continuity mistake: When Christy first dies, he makes a bird fly, then the bird poops on the top of his head. In the next shot, the poop is gone from the top of his head and now it's on the side of his face.
Answer: It's open to interpretation, but one theory might be that Chris' faith and his assumptions about the Afterlife have been completely "upended." And as Annie has lost her faith altogether, he must now struggle to bring her back into the fold and set things right so that they can be together.
Jean G