During his own testimony, the actor James Callahan is also seen at the same time in a reaction shot seated at the back of the courtroom.
During Hamilton Burger's closing argument to the jury, there are several shots of Perry with the courtroom wall close behind him. At that point in the trial, Perry should have been seated at the defense counsel's table.
During the opening sequence, when Janice Wainwright answers the telephone, she picks up the handset of a multiline telephone - but none of the lights comes on to indicate which line is ringing.
When Mason opens the suitcase that Janice Wainwright brought to him, the top of the suitcase appears to be about 1 inch thick, and the bottom is about 3 1/2 inches thick. When he opens it, the contents only fill the bottom section of the case, and are neatly arranged. Since Janice brought the case in carrying it by the handle (in an upright orientation), the contents of the case should have been jumbled, as they did not fill any of the top.
When Janice Wainwright carries the suitcase into Mason's office, based on the associated trivia item, it should have weighed over 25 pounds (for both the suitcase and the items inside). Yet she lifts the suitcase and places it on Mason's desk with little effort.