A movie by one of Hollywood’s most successful directors that’s based on his early life begins, appropriately enough, at a movie theater and ends in a movie back lot. “The Fabelmans” is clearly a very personal film for Steven Spielberg and it’s as much a coming-of-age journey as a form of expensive therapy with John Williams offering lovely mood music. The script — Spielberg reteams with playwright Tony Kushner — charts both fledgling director Sammy Fabelman’s first 20 years as well as the cracks appearing in his parents’ agonizing marriage. The focus sometimes gets a bit blurry, to be honest...