Corrected entry: At the end courtroom scene where Vinny is questioning Lisa, after she looks at some pictures he asks "does the defense's case hold water?", and she answers "no, the defense is wrong..." What Vinny and Lisa seemed to forget is that THEY were the defense - they were in fact saying that their own case didn't hold water. We can only assume that Vinny meant to ask "does the PROSECUTION'S case hold water", since that's who he was really opposing.
Corrected entry: In the scene where Vinny is describing how the trial will work, using the "brick" explanation, he pulls the Ace of Spades out of the deck and shows it to the camera. Later in the scene, he is waving the card around. Somehow it has now become a Joker.
Corrected entry: The night before the final day of trial the prosecutor calls Vinny and tells him he "just found out" about "new evidence" that he intends to introduce the next day at trial. However this "new evidence" turns out to be an expert witness who testifies about the type of tyres the shooter's car had. This expert discusses tests he had performed, comparisons he had made, and the results he discovered in reaching his opinions (all past tense). There is simply no way the prosecutor could not have known that an expert had been hired to do the testing and comparing and that all this was going on, so it can't be "new evidence".