Continuity mistake: In the play before the final touchdown play, the announcer says it's now second and whatever, but the down marker in the background is set to first down.
Continuity mistake: In the scene when Jerry arrives at the top star's house to make sure he's still staying with him, he arrives in an Eagle Vision car, but later leaves in a Pontiac Grand Prix.
Continuity mistake: When Tidwell is out cold in the endzone the ball is clutched in one hand against his chest. Within a couple of camera shots, the ball switches from left arm to right arm a couple of times.
Continuity mistake: When Tidwell gets the wind knocked out of him at the Christmas Eve game, and he is lying in the end zone, he is clutching the ball to his chest. When the camera pans out to a distance shot, his arm is outstretched and the ball is lying off to the side. When the camera comes back in for a close up, it is clutched to his chest again.
Continuity mistake: After they return from their date, on the porch Jerry ties Dorothy's dress. A couple of seconds later the knot is entirely different.
Continuity mistake: In the scene where they are at Dorothy's house and Tom Cruise is waiting to go to dinner with her, first he has 5 buttons done on his shirt. The next shot he has only 4 buttons done, and then when the camera turns back he has 5 buttons done.
Continuity mistake: In the scene when Jerry is leaving the agency after being fired, Jay Mohr's character (Bob Sugar) is visible behind Jerry when Jerry is near the fish tank. Moments later, Sugar is no longer in the same position. The next shot from that angle, Sugar is back again.
Continuity mistake: In the scene where Jerry McGuire is giving his farewell speech to the large group of people at his agency, he unbuttons his coat. Throughout the speech, the coat continually buttons and unbuttons itself.
Continuity mistake: When Dorothy and Jerry kiss on the sofa, her beer glass is still on the tray on the table in front of them. A shot appears with no beer in view. The tray is slightly out of shot but the top of the beer glass would certainly be in view. In a longer shot, the beer is visible again. Dorothy does not touch the glass between shots.
Continuity mistake: Jerry receives a fax containing Rod's contract. Everyone is angry at how small a salary it is, but Frances gives Jerry a lecture, and everything works out. When Frances is talking, you can see the hands of one of the crew members in the glass of a poster in the background.
Continuity mistake: During the final game, before it starts there's a shot of a player warming up and throwing a ball. When the camera follows the ball, for a brief second we see that the bleachers are empty, but immediately afterwards several shots of the stadium show it's packed with people.
Audio problem: In the scene where Jerry and Dorothy are having dinner at a restaurant, Dorothy leaves the table to make a phone call. While she is on the phone the Mexican musicians come over to Jerry and start playing music at their table. At one point, the shot is on Jerry with the violin player standing behind him. In the song they are playing you can hear the sound of the violin playing, but at the same time the violin player standing behind Jerry drops his violin and is holding it at waist level while the song is still playing. Since he is the only violin player there is no way we should still be hearing it in the song.
Continuity mistake: When Jerry and Dorthy are standing out by the U-Haul truck Dorthy walks to the front of the truck and Jerry takes a step to the spot where Dorthy was standing. He is still moving, but then there is a close up of him and he is not moving.
Continuity mistake: When Jerry arrives at Dorothy's house to take her out for dinner she is wearing a dress with a very high neckline. In the next shot of her the dress has a much lower neckline, and then changes repeatedly between the two dresses.
Continuity mistake: When Jerry (Tom Cruise) asks Dorothy to marry him, she initially has sunglasses on, and Jerry pulls them down to the end of her nose. In the next shot, the glasses have miraculously moved up her nose a bit, and as she finally cuddles him, they are fully back up where they started.
Plot hole: Towards the beginning of the movie Dorothy first "meets" Jerry by eavesdropping on his conversation with a woman in the airplane. But Jerry is located in First Class whereas Dorothy is in Coach. Going by her seat location it seems like she's sitting at least 10 rows from Jerry, plus the area that divides Coach from First Class between them. And Jerry is speaking in a soft voice. Add to that the drone that an airplane makes (even if not airborne) and it's highly unlikely that she would have been able to hear him, even if he was the only person talking in the plane (also unlikely).
Continuity mistake: In the scene in front of Dorothy's house when she and Jerry are talking, Dorothy tells Jerry "I'm not built that way", then Jerry leans forward with his elbows on his knees with his head down. The camera shot is behind Jerry's back when Dorothy leans over and puts her hands on Jerry's head and gives him a kiss, then gets up to go in the house. But just as she kisses him and gets up, the shot changes to in front of Jerry, except now he is resting his head in his left hand, where just a second before his hands were nowhere in sight.
Continuity mistake: During the scene in which Jerry and Avery break up we see him comforting her right before she punches him. When the shot is from behind him you can see that he is holding her and stroking her face with his right hand. As the camera switches angle to face him his hands are now at his sides.