When taunting Elias (a devout Christian) over his love of the Transformers, Randal refers to The Devil as "The Fallen". In Transformers mythos, The Fallen is as close to a Judas analogue you can get (Unicron being The Devil). The Fallen is even perpetually on fire.
Randal might have left the coffee pot on in a subconscious desire to help Dante change his life around for the better.
It sure does take the fire department a LONG time to respond to Dante's 911 call about the 'fire' at Mooby's. There's enough time for the entire donkey show, Becky's arrival and her and Dante getting together and Emma's arrival and the end of her engagement to Dante.