This is a kind of small bug/peeve - but the graphing doesn't start from the origin (0,0, usually). If you graph two hands, the first in which you win $5 and the second in which you win $5, there will be a line from 0,$5 to 2,$10 (if that cartesian notation kind of makes sense).
For a lot of my graphs, it's just visually appealing to see the graph start from $0. :)
