When Sam reveals his last hand, he slides the cards until they are side by side on the table, but the next shot shows one partially covering the other.
At the morgue in the beginning of the episode, the man's birth day was listed as April of 1984, which would make him 23, not 24.
At about 21 minutes in when Sam pushes Bobby in his wheelchair, a Canada Post truck can be seen driving through the street in the background. Immediately afterwards, there is a sign above their heads saying "Cicero Motel Parkade Entrance." Parkade is a distinctly Canadian word meaning parking garage.
When Sam bluffs with two Queens on the board, Patrick says, "set of ladies I'm guessing," thinking Sam has a Queen in his pocket for three Queens. He would have trips at this point. A set is when a player has a pair in his pocket and another one comes on the board. Though these terms are commonly swapped among amateur players, it's unlikely Patrick wouldn't have known the difference.
When Bobby, Sam and old Dean are sitting in the van watching Patrick before and after he is hit by a car. Bobby is in the driver's seat. Bobby is paralyzed from the waste down, he would not be able to push the gas or brake pedal while driving.