@Merlin Thanks for the reply!
The beer sloshing for some reason worked in-editor, but would not work in the final build. Without any build errors, it kinda didn't make sense at this stage of the dev process to investigate. The car was a standard Unity asset, and we just slapped a new model on top for a quick proof of concept. We had intended to replace the standard Unity car sounds, but our sound guy ended up not being able to make it; which is also why the music was simply "borrowed" from a you tube link. As far as the freezing of the game when you reached the moonshine still, that was by design but obviously not communicated. After the lady said "GO!", your car should have unfrozen and allowed you to continue driving, unless you ran out of "Moonshine fuel" which you couldn't see in the pint glass.
Thanks again for the comment!