After a Muni inspector showed up, Harriet decided to claim she'd been
manhandled, and insisted on executing a citizen's arrest of the inspector. Apparently "Because you're a ridiculous, goddamn ingrate" isn't reason enough for a cop to dismiss such an action out of hand. A police officer arriving on the scene "accepted the arrest."
After interviewing other bus passengers -- who must have been really thrilled by this point -- the officer "determined the accusation to be false and released the inspector," according to a subsequent police report.
At this point, the charming couple and their cur were allowed to walk away, with their tails between their legs. Which is exactly what the driver asked them to do in the first place.
All that was wasted were riders' afternoons, the dignity of a Muni inspector, and a cop's time. No biggie, right?