Factual error: In one scene Cobb and the sportswriter doing his biography are driving across the country to get to the baseball Hall of Fame. They are stopped next to some railroad tracks fixing a flat tire, and a train goes by that has Burlington Northern markings (BN). Burlington Northern didn't come into existance until ten years or so after Mr. Cobb died.
Factual error: When Blankman is riding on the train tracks with his custom mobile, the computer screen shows a straight track when they are actually on a curve.
Factual error: When Dylan wakes up in the hospital, under a plastic tent, we hear the iconic "flat-lining" sound of a heart monitor. Dylan then removes the clamp from his finger and the sound stops. The clamp is an oximeter, a device that measures blood oxygen concentration. The wires going under his shirt are the heart monitor. The sound should not have stopped. (01:12:42)
Factual error: Roger's dad says when the "Angels win the pennant." During the last final scene/regular season game, after the win, Ranch Wilder announces that "the Angels won the pennant." They would have to have won the American League Championship Series in order to win the pennant.
Factual error: The drug-runners at the start of the film mention that their scheme is to smuggle cocaine by mixing it with molten plastic, molding the plastic into dolls, shipping them and then re-melting the plastic to separate the cocaine again, which will leave it "100% pure." While you can indeed smuggle cocaine by mixing it with plastic, the process to recover it is way more intricate than simply re-melting the plastic, and requires chemists to treat the plastic with all sorts of chemicals and compounds in a complex process (and it will not be "100% pure" as suggested), and it is usually done with larger plastic objects (like plastic dog-houses or car-parts), as something the size of a doll isn't going to be able to hold all that much cocaine.
Factual error: A carton of HEB milk is taken out of the fridge and it has the new (as of 1994) label on it. The movie is set in the late 80s, when the old style label was still used.