Continuity mistake: When Eddie is hiding with the golf club, there is a blue chair which got knocked over during the murder. But a few minutes later when Eddie is peeking round the corner to check for intruders, the blue chair is magically standing upright again.
Continuity mistake: When Eddie is eating breakfast and waiting for Van Loon, his hands and the food he is holding change position repeatedly between shots; sometimes his hands are down, sometimes they are holding up some food, and the amount of food he his holding changes too.
Continuity mistake: At the beginning of the movie, when the shot pans up the front of Eddie's building from street level, there is a balcony a few levels before we reach the top. When Eddie looks down from where he is standing and we see the front of the building from his point of view, the balcony is no longer there; the front of the building is now completely flat.
Continuity mistake: When the fight in the apartment occurs Victor is choking Eddie. At the start of the scene the dish sponge he eventually shoved in Victor's mouth is resting beside the sink. When the camera angle changes the sponge is in the sink. When Eddie grabs the sponge it's next to the sink again. (01:20:52)
Continuity mistake: In the restaurant scene at the end of the movie Eddie's flag lapel pin is right side up. The camera cuts to the waiter and when it cuts back to Eddie the flag pin is upside down.
Continuity mistake: Before Eddie dives in to the sea, the sunshine is indicative of midday, but when he is swimming it's more like evening.
Suggested correction: The main character says he did quintuple his money four days in a row, not that he could continue to do so. "Presumably" he could do anything, like robbing a bank. Gambling is not a secure source of income, even with knowledge of the odds and every tell, he could also lose a lot of money.
He takes the seed money and then goes on to make a couple million with it on the stock market. There's really no reason he couldn't have just done that with the $800 seed money (also what the hell happened to that $10-20k stack of cash he took from Vernon's apartment? Somehow that was dwindled down to only $800?). The time constraint was totally artificial. He didn't need to conquer the world in 2 months except for the needs of the plot.