Can't give a statistical edge, but I've always liked taking halftime lines on the favorite when they are down. i.e. Miami (-5) for game, but down 7 at half. If the halftime line is Miami (-8), that is net Miami (-1). The key is, IMO, to be able to understand the ebb and flow of the scores. Has Miami been down 10-15 points all game or were they up 2 and the other team went on a 7-2 run last 2:00 minutes of 1st half. 1st example probably don't want Miami, 2nd example, well haltime score doesn't reflect what is really going on.
Now then, I think of markets much in the same way...
FS