The game breaks away from Telltale's typical attempt at keeping close to the original content, but seeing as this is the first time the company has tackled a live-action license, that can be expected. Instead, the style of both the characters takes on a more exaggerated and cartoon feel, but each of the characters still match up to their silver-screen counterparts really well.
For the most part, the game's audio is also dead on. Dialogue is great and feels appropriate for the various characters, and Christopher Lloyd reprises his role of Emmett Brown. Unfortunately, Michael J. Fox only lends his likeness to the game, but the replacement actor, AJ LoCascio, does a spectacular job sounding like the young McFly.
The background music also hits the nail on the head as the original Back to the Future theme is used prominently throughout the game, usually during the more dramatic sequences, and elements of the song can be heard during the more humdrum parts of the gameplay experience.
The only issues I found with It's About Time's audio is the occasional lack of dialogue when its obvious the character was saying something. It didn't happen often, but every now and then, it was like the trigger to start the audio just wasn't hit. While nothing important was ever said during these times, it was still noticeable.