At [12:04], Ron misses his second roll down the lane, and only picked up seven pins with his first roll. However, at the final frame of the game at [16:55], the Bowler (a.k.a Ron Swanson) does not have a single roll of seven pins at all.
At around [10:11] Derek is bowling and he slides as he releases the ball, causing him to step on the foul line- he wouldn't have gotten points.
In "Bowling for Votes", Leslie Knope holds up the newspaper article regarding Ben punching out a voter at the bowling alley. The first three paragraphs report the story, but beginning in paragraph four the story begins to repeat itself. (time: 17:30)