That Moll! Always good for a callback!
In the parking lot, Carol is staring at Shawn and watching him mop the floor, just like Molly said. If this were The Sopranos, she's have a gun in her lap and be ready to blow his head clean off, that's how spooky the scene comes off. Shawn locks up and goes to leave the building. Carol jumps out of her car and goes to meet him. She introduces herself, but he already remembers who she was...she was the woman who led him down the career path of mopping a Pack and Sack at 12:30 in the morning rather than snorting blow off an NBA cheerleader's chest after a successful tournament final. Carol's a tad uncomfortable all of a sudden and wants to buy him a coffee. He tells her it's late and he has to get some sleep because he has to open the store the next day. She says that she's been thinking about what she did and is ready to admit that she made a mistake. She should have found a way to make an exception so that he could have gone on and played pro ball. She knows that telling him this isn't doing any good this late in the game, but that teachers have so many rules that they must abide by that it never occurred to her to make an exception for him. She's human; she makes mistakes. Shawn stops her pitiful diatribe and reminds her that it's late and he has to be back in by 5 AM. He then jogs away from her, stops on a street corner to let her words sink in for a second or two, then jogs away.
Ed walks up as Shawn's jogging away. He goes to hug Carol and she sobs in his arms, knowing now that she really, REALLY screwed up a kid's life. Ed asks her if she's ever tried a peanut butter and bacon sandwich. She says, "No." He softly says, "Come with me," and the show ends as they walk away.
The moral of the story? If you're an adult and stuck in a dead-end job that you absolutely hate...blame a teacher.