There was definitely a lack of focus this entire series.
The DP ball was Devers covering 2nd due to the shift; he got the error. (personally, if you are going to shift, leave Bogaerts in his normal position and put Devers/Nunez on the right side, then only one guy is playing out of place).
As for pitching, don't let Lopez's record fool you. He's a very good young pitcher. There have been 4 games this year where he has gone 7 or more innings and allowed 2 hits or less. That's tied for the Major League lead with Jon Lester. He's got a lot of there there. As soon as he figures out consistency (and he will), he's going to be very tough.