Visible crew/equipment: While passing the frat-house bus, in the close-up, as the two girls are about to flash, the reflections of the camera and two crew members moving on the crew's vehicle are visible on the glass window. (00:14:15)
Continuity mistake: Jack drops the two vials into the Tom Collins glass, while in the bathroom. At the hand-off, when he places the drink on the tray, there are no vials in the glass - there is no ice blocking them from view, just a skewer holding a maraschino cherry, a wedge of lemon, and a straw - no vials. Even Jack can't make the two vials invisible. (01:23:40)
Continuity mistake: When Jack and Greg are in the motor home near the beginning of the movie, Jack is talking on the intercom mic to his family in the back, then puts it down when he is finished. But, in the following shot that shows Greg talking, you can see Jack's reflection on the window, showing him still talking into the mic. (00:13:30)
Continuity mistake: When Greg does damage control in Roz's office by hiding things, the height of the table is about Greg's waist level - also note the wood paneling trim. In the previous shot, as Greg surveys the room, the table is a foot lower, which is also seen in other shots including when Greg enters the room, after the football game, to check on Jack and the table height is level with Greg's thighs. The entire table was deliberately raised in the close-up. (00:27:00)
Visible crew/equipment: When Jack and LJ take off in the motorhome, while ignoring everyone's shouts to come back, the crew's blue tent is visible in the reflection on the motorhome's large side, as it turns the corner. (01:35:35)
Continuity mistake: When they all first arrive at Roz and Bernie's, Jack brings LJ over in the stroller. As Bernie babbles, "Bazooka, bazooka," and LJ starts crying, the stroller's orange flap (between LJ's legs) is attached to the front harness around the boy's waist. In the previous couple of close-ups of Little Jack, the orange flap hangs down between his legs. (00:23:25)
Continuity mistake: During the scene when Gaylord's dad has just found out that Pam is pregnant, Bernie enters the room with a bottle of champagne. he crosses to the bed whilst removing the wire top of the cork in preparation of removing the cork. Cut to Gaylord and then back to Bernie and he is removing the wire again. (01:12:30)
Visible crew/equipment: When Pam and Greg walk to the RV and open its door, in the next shot just as Moses chases Jinxy, behind Jack, Roz and Dina, the reflection of a hunched over crew member, wearing a red shirt, is visible. Don't confuse his reflection with Bernie's, who is also wearing red. (00:36:10)
Visible crew/equipment: After Jack says, "Only the captain gets to make announcements, Greg," in the next shot of Greg the boom mic and pole are nicely visible over Jack's reflection in the window, to Greg's right. There are two other shots of Greg at this angle - one previous and one following, but unfortunately the equipment is not seen. (00:13:25)
Visible crew/equipment: When Officer LeFlore arrests Bernie and Greg, lovely reflections of the reflector screen are seen in the lenses of the officer's sunglasses. There are other moments in the film where the reflector screen is visible in lenses. (00:51:40)
Audio problem: At the end when Greg and Pam get married, Kevin plays a song on a set of pipes, however, the notes he plays are wrong - when he blows the short pipes, a low note is made, and vice versa. This should be the other way around. (01:45:45)
Continuity mistake: When Jack places Jorge's hair in the test tube, he holds Greg's vial, and the name "Greg" is written with the first "G" beside the stopper. However, in the next shot, when he places the vials into the glass, the name is actually written the opposite way, with the last "G" beside the stopper (this is also seen earlier, when Jack inserts Greg's hair). Tape and handwriting differ as well. (01:23:20)
Continuity mistake: The time frame doesn't make sense when the kid glues his hand to the glue bottle. He turns on Scarface, which is nearly over. The Fockers and the Byrnes are still in town shopping and Little Jack smears glue all over his hands. By the time they get home from town, the glue bottle is well stuck to the hands. However, Scarface is still on and still on the last fight scene. (01:06:25 - 01:07:30)
Visible crew/equipment: In the scene where Greg is leaving a message on his parents answer machine about going to their house in the Byrnes' motor home, you can see that it is just Stiller standing in front of a blue screen, obviously they wanted to add the scene in after shooting had finished. (00:11:55)
Continuity mistake: When Pam and Greg step into the motor coach nothing is on the counter between the sink and stove. However, in the shot facing Dina there are groceries right beside the sink, at the edge of the counter, including a box of Orville Redenbocker's microwave popcorn. (00:12:20)
Continuity mistake: Jack's Tom Collins has different amounts of liquid when they are sitting by the lagoon. (00:32:20)
Audio problem: As Greg and Pam are about to get married we see Kevin playing the panpipes. The sounds are not in sync with his mouth as he blows down each pipe.
Continuity mistake: When Bernie tackles Jack, the ball drops at his feet, beside Jack. When the camera cuts away, the ball jumps ten feet away from Jack and Bernie moves away from both of them.
Continuity mistake: As they are all outside drinking Tom Collins', the 2 cherries in Greg's drink are at the bottom, then when he leans in to answer Jack's question about his 'sister', the cherries are now at the top of his glass. The cherries actually switch back and forth in several shots. (00:32:15 - 00:32:30)
Continuity mistake: After the baby escapes from the crib, Greg walks past it looking for him and the gate to the crib is wide open. Next shot, the gate is closed and there was no time for him to close it.
