Pacers and Bucks being the only two who improve quarter by quarter is interesting. Not sure if it signals much but I would have thought there would be more than two teams who happen to be like that
You can add the Lakers to that. I guess it's natural for scoring to distribute over the quarters since being behind incentivizes playing your best players for longer and hustle in general. In addition, if you know your opponents are slow starters for example, part of the game plan might be trying to exploit that which would make it a self enforcing feedback loop.