Other mistake: When Eddie arrives at the casino, a man with a white jacket can't help staring at the camera for several seconds.
Continuity mistake: When all three are having dinner for the first time, Vincent's hands' positions are not continuous between shots. Sometimes they swap between crossed or not, or they're holding a glass or not, or the glass swaps hands.
Visible crew/equipment: During the second trip around cities, the camera is very close to the car, and a rectangular black object is reflected on the chromed frame of the grille, most surely the camera or the structure it was attached to. One can see what seems to be fingertips on the upper part.
Answer: Because it wasn't about the money or a personal issue with Vincent. Eddie had a sudden realization about his own integrity and what he was doing (helping to rig games' outcome to skew betting odds). He wanted to win legitimately against Vincent. Earlier, he had become rather fed up with Vincent's egotistical nature and arrogance, which led to them parting ways.
raywest ★