1. Like a lot of the United States, the Celtics seemed to be suffering from a post-Thanksgiving hangover on Friday. Without any Black Friday shopping to jump start them, Boston slogged through a 112-107 loss to the Nets. Much like the win on Wednesday in Boston, the Celtics struggled to defend the three-point line, couldn’t contain Brooklyn on pick-and-roll plays and were sloppy with the ball. That last one was a particular problem, as the guys in green threw it away 19 times. Many were careless, lazy or a combination of the two, like this turnover from Jayson Tatum: