Abra is so happy to finally meet another person like her that she practically jumps out of her skin. It's hard not to smile when she and Dan first meet up, especially considering how happy and relieved they both feel at that moment.
One of the last ghosts Danny sees at the Overlook is his father, who grins and waves to him before everyone leaves.
Not only does he show up and wave goodbye to Danny, it's heavily implied that he helped push Rose to her death, thus saving the lives of his son and granddaughter. Not a bad way to make up for what happened last time around.