The year of birth of Oliver's father, Robert Queen, is indicated as 1948 on the TV news item confirming his death, whereas the tombstone at the Queen mansion shown in this and subsequent episodes reads 1958.
While Oliver is standing on a table at his nightclub party, he lifts a shot of tequila to his lips with his right hand. But when the angle shifts, he brings the glass down in his left hand. The angle shifts again, and the glass is back in his right hand.
When Oliver and Tommy pull up outside the old Queen Industries factory, the logo's reflection in the car window reads left to right instead of being reversed.
An arrow is shown, revealing how Oliver took the money from Hunt. It is clearly visible, and it is incredibly unlikely that it would not have been noticed.