When Henry tries to buy a camcorder, in the video shop, Ruben stutters that the only 'ready to go' cameras are "ffffujitsu" or "fffuji". When Henry is filming in the nearby homeless area, the camera he has bought is a Panasonic.
The cab that Henry and Dr. Gill steal changes from a Kia Sedona to a Dodge Caravan.
When Henry and Bix are talking at Junior's, Bix gets a whole pie and starts eating it. A second later in the same conversation, the pie is almost all gone.
When Dr. Sharon Gill drives the cab and is pulled over by the cop for speeding, the seats of the cab change. In one scene the seats are without the head rest while the seats appear more modern when she reaches the dance school.
While Tommy's mother is telling him over the phone that his father is dying, the sweat on Tommy's shirt appears suddenly. When he hangs up the phone, the sweat is not there.
Based on the kippah worn by Peter Dinklage's character, Henry's family members are practicing Jews. Henry is cremated, which is forbidden under Jewish law.
When Dr. Sharon Gill is driving the taxi and almost hits a bus, the traffic light is green. It is the bus that runs the red light, not her as implied.