During the fight, Rudy hits Cliff's head/face area with the bat. A notable amount of blood hits the wall. A moment later, when Cliff's face is shown, there is no wound or blood visible anywhere near his face or head.
Rudy's wine glass keeps repeatedly jumps between almost full and almost empty between shots when he is in the restaurant with Deck.
As Rudy first reads the "stupid, stupid, stupid!" letter from Great Benefit, he says it's signed by Everett Lufkin, Vice President of Claims. Minutes later, when Donny Ray's nose bleeds on the letter, we see that it's signed "Russell Krokit, Senior Claims Supervisor". Additionally, this letter is shown as being dated April 25, 1995, while the blow-up Rudy shows during the trial (now signed by Lufkin) is dated July 7, 1996.
During Rudy's first conversation with Miss Birdie, the amount of writing on his legal pad varies between shots.
The microphone stand when Wilfred Keeley is in the witness chair.
When Rudy is late for court, Deck takes his place briefly. Deck was not admitted as an attorney and hence could not have done this. All counsel enter their appearance at the start of a trial including those who may not even speak on the record. The judge should not have allowed Deck to utter one word at the trial but does so.
The judge could not have admitted Rudy to the Tennessee Bar in his courtroom. Even though he has passed the bar exam, Rudy would have to apply for admission to practice through the Tennessee Supreme Court.
When handed a computer printout to read on the stand, Wilfred Keeley played by Roy Scheider opens the printout like a book and finds the data. Closeups show the printout is in landscape mode and couldn't be read as Keeley does. As the reading wasn't challenged by Baylor (Matt Damon) the position of the printout wasn't scripted.
When Rudy rolls up the projection screen after his closing argument the image on the projection screen remains but doesn't project onto Rudy's back, nor onto the wall behind it as the screen rolls up.
After they're told they have 5 minutes, the guards return in less than three.
Virginia Madsen's character's last name "Lemancyzk" is misspelled. It should be spelled "Lemanczyk."
After Cliff pushes Rudy away and starts to walk towards Kelly, we hear him speaking but his mouth doesn't move.
When Deck Shifflet is staging the juror's call to Rudy Baylor's office, a crew member walks onto the set and backs off when he realizes the situation.
The supposed Luxor Hotel claimed in a previous entry is erroneous; in some background shots the building is actually the Pyramid in downtown Memphis.
The movie is said to take place in Memphis, Tennessee, but several times the Luxor hotel in Las Vegas, NV is seen in the background.