Continuity mistake: When Gail, Laurie, and Pete realize they forgot Melinda, Johnny is wearing his leather jacket when Roy says "Look, it's a boy," but in the next shot Johnny's jacket is gone when he asks what happened.
Other mistake: When Pete shows Laurie the newspaper, in the closeup of the article about Gail and Laurie entitled "women paramedics save shooting victims", the paragraphs under and around the title are repeated, and have nothing to do with the title.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy