Big Fish, about the reconciliation between a tall-tale-telling father (Albert Finney) and his skeptical son (Billy Crudup), is an odd Tim Burton film, but not in the way that a Tim Burton film usually is odd. This time he forgoes his artful despondency for an unadorned, unabashed emotional warmth. Still, Burton purists needn’t worry: There are plenty of fanciful touches in the flashbacks, which feature Ewan McGregor as a younger version of Finney’s character.