The concert scene of Chuck Berry (which was originally shot by D.A. Pennebaker) showing the singer holding the guitar as a left-handed, but later as right-handed.
Crew are reflected in the side of the car (at around 46 mins - sound man, microphone and other crew. This is why so many cars in movies appear dirty or have a matte paint job.).
When Philip is looking at the motel room key at the Skyway Motel after Alice finds it in his bag, he mentions it is in North Carolina. However, right on the key tag is its real address in Jersey City, New Jersey.