DIY cinema is rarely as endearing, creative and stuffed with goofy gags as AJ Goes to the Dog Park. Directed by Toby Jones, this is an anything-goes, no-budget comedy that’s so lo-fi it’s practically underground. And underground is where this cult item will ultimately live, as only viewers attuned to its live-action Looney Tunes sensibility will groove to its boatload of self-referential dialogue, puns and visual gags that come at an impressively dizzying pace.