The first rule of any baseball movie is that the guys cast to star in it have to look like they can play. And in “Home Run,” Scott Elrod had the build, the swagger and the sweet swing of a big leaguer. That makes him and this thin tale of 12-step redemption credible and watchable, if nothing else.Elrod, a character actor who played a hunk hired to perform the fake film script in “Argo,” here is a big-league slugger with alcohol problems and daddy issues.The booze we can see in his everyday routine – dumping out the soft drink, filling the cup with vodka.