As Reddit user toksic316 points out, "Lorraine's dad is a bad driver so, how many kids has Lorraine's dad hit with his car?" The question is a valid one, as the quote implies that there have been several kids prior to George who have jumped in front of his car, and who he's subsequently hit.
An even better question the Reddit user brings up is whether Lorraine's father is increasing his hit count because of his bad driving or because there are more Peeping Toms like George who happen to be using the tree for the same nefarious purposes.
Earlier in the film, 1985 Lorraine recounts the story of how she and George met when her father hit him with the car. "I don't understand what dad was doing in the middle of the street," Marty's sisters says. "What was it George, bird watching?" Lorraine asks George. George immediately gets nervous and avoids answering.
We find out George was watching her from a tree, but now, because of Lorraine's father's comment we have two lingering questions to which we may never know the answers: Was Lorraine's father a terrible driver who was constantly hitting kids or were there just a constant flow of peeping Toms falling from that tree?
