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.
In the court room, Rudy Baylor hands Wilfred Keeley a computer report about 3 or 4 inches thick. When Keeley hands it back to Rudy it's only about an inch think. The reports on the table behind Rudy continue to change size and position from the ones that Mr. Keeley is looking at.
Around 13 minutes in the film when Rudy is questioning Mrs. Birdie about her will, the amount of writing on his legal pad changes from shot to shot, sometimes showing a blank pad, to showing various amounts of scratched out text.
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.
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.
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.