When Mike is in the taxi, his seat belt is visible in the first shot, but it then disappears for the rest of the ride.
When Harvey asks Louis, "Are we practicing law down here or auditioning A Chorus Line?" the clock on the wall is 5.55 in the first shot but 6.05 in the next.
(at around 1 min) Harvey gives Mike Ross his business cards in a box, but when Ross picks it up, he only holds the top cover. Also, the hand which holds it in the next scene is obviously from an older man's hand, not the actor's actual hand.
At 0:36 there's a shot of Mike with earphones in. We cut to Louis when he says to Mike, "You don't know the lyrics, do you?" and when we cut back to Mike, the earphones have disappeared completely.
When Harvey learns of the lawsuit from the accident, he says he needs to meet with Travis Bickel, who was the other driver and lawyer; however, later it's established his name is Tony Santana, not Travis Bickel. Travis Bickel is a character from the 1976 film Taxi Driver, whom Harvey referenced.