Continuity mistake: At the fondue dinner, when Roz says, "Of course not, that's Greg's foreskin," in this shot Dina holds down the album page with her left hand, as she holds the skin over the album. In the next shot facing Jack, Dina drops it and it falls beyond the open page, yet, in the next close-up the piece falls directly on the open page with the photo. (00:46:15)
Continuity mistake: When Greg sees Jack in the mirror, Jack has one hand behind his back and yet when Greg looks at Jack directly in front of him, both of Jack's hands are behind his back. (01:25:30)
Continuity mistake: The pen photos that Jack takes of Jorge do not match the ones shown on the upload screen when he sends them to the CIA, inside of the motor home. When he actually takes the pictures, he does them in rapid succession. Jorge is right in front of of the RV about a foot away and all you can see in the background is the RV since he is standing so close to it. On the uploaded photos, Jorge is at least 5-10 feet away from the RV, up on the sidewalk. He is also now at the end of the RV and the photos show the house across the street in the background. (01:05:25 - 01:16:55)
Continuity mistake: All the glasses of wine and the bottle change position and amount of liquid during the dinner scene.
Continuity mistake: In the scene where Greg comes in to his parents bedroom and they are having fun with whipped cream, there are 2 pillar candles by the door. These candles are seen in several of the shots showing Greg. The flames keep going out and relighting, but the candles are too new for the flame to be just dipping out of sight, and besides those sort of candles will often glow near the top when that happens. They must have kept blowing out between takes and the crew kept lighting them. (00:48:40)
Continuity mistake: When Greg places the luggage on counter in his apt to measure it, the front pocket double zippers are closed at the bottom of the left side. When Pam comes home and he describes the birth, both zippers are at the top center of the pocket. (00:02:20)
Visible crew/equipment: As they start out on the trip, when they are showing Jack & Greg up front, you can see in the window right behind Greg a reflection of two crew members wearing sunglasses. They stay in frame for about 5 seconds. (00:13:21 - 00:13:26)
Continuity mistake: When Bernie is lying in front of the bus to protest Jack leaving, in the first shot his head is directly aligned with the wheel well and his feet are under the license plate. When they show Bernie getting up, he is way out to the right of the bus by a couple of feet. (01:32:11 - 01:32:36)
Continuity mistake: In the foreskin scene Greg grabs the photo album and he and his mom start a tug of war. His mom's wineglass is right next to her arm and then in the next shot it is about a foot away. (00:46:30)
Continuity mistake: When the airline agent bumps Pam and Greg to first class, she holds out the tickets, with white at the top. In the next shot facing Greg, as he takes the tickets, the yellow is at the top. (00:05:00)
Continuity mistake: When Bernie shows off the "wall of Gaylord" the sports lamp (with soccer ball, baseball and glove) sits on the left of the dresser, with framed photos beside it. However, when everyone heads to the lagoon, there is a close-up of a framed jockstrap, which now hangs prominently beside the lamp. (The jockstrap normally hangs behind the lamp, which blocks it from view.) (00:27:30 - 00:30:40)
Continuity mistake: When demonstrating the baby's "sign language", Jack puts a series of cards on the table. You see him start to put the "poop" card down in one shot and even hear it hitting the table and being moved slightly in the next shot. But after those shots, you see him put it down again. (00:09:05)
Continuity mistake: When Jack and Greg honk the horn at the bus with all the girls, not including the driver, there are four girls looking out the windows at the front half of the bus. These girls have a purple bra, a pink bra with long shirt sleeves, an orange/ pink bra, and then a dark green bra. After two girls flash, the girl in the pink bra (#2) with long shirt sleeves, and the girl in the dark green bra (#4) are suddenly at the back half of the bus. Look at the lettering on the bus "Manassas University." In the 2nd shot, they are now after the "Y" in "University." (00:14:15)
Continuity mistake: During the scene when Gaylord Focker enters the room, while Bernie and Roz have fun with whipped cream, notice the whip cream on Bernie's face. Although the amount of cream would change because Bernie wipes his face, the amount and location of the whipped cream changes, goes back, changes again, and is almost completely different in each shot. Once wiped away, it is highly unlikely that whipped cream would magically reappear in the exact same spot as before, and then disappear again. (00:48:25)
Continuity mistake: After the baby gets soaked with the toilet water, you see him being brought into a bedroom wearing a towel. Next shot the towel is underneath. The transition of him being undressed is missing, despite the audio being continuous and thus not revealing an ellipsis in the action.
Continuity mistake: In the scene where Pam and Jack do the shortstack rhyme, Greg suddenly joins in and says "Ba ba ba ba ba ba ba." At that moment, Jack is looking at Greg. Then in a split second, when the shot changes to the other side of Jack, Greg, and Pam, Jack is looking at Greg's hand, then looks back up at Greg. (00:07:10)
Visible crew/equipment: Two shots after Gaylord touches the boob, you can see a boom mike dip into view.
Continuity mistake: When Greg goes into his mom's office to quickly put away all the sex toys and objects before the Byrnes come in, on the dresser, to the left of the door, is a statue and a shell. In the next shot, after Greg has shoved the statue behind the desk, the shell has now moved from the left to the right. There is no time for this as it is shot as a "continuous" sequence. (00:27:13 - 00:27:19)
Revealing mistake: When little Jack is lying down in his crib in the Byrnes' room, after Jack comes in to rest from the football game, you can easily tell this isn't a real child but just a doll. The hair is wrong and there's no movement, like breathing. (00:55:05)
Continuity mistake: During the fondue dinner, not only do the positions of the fondue skewers change in consecutive shots throughout the meal, in some consecutive shots there are three skewers, then four, then three and so on, resting in the fondue pot, depending on camera angle - not due to people touching them. (00:38:25)
Answer: Truth serum doesn't automatically make you speak the absolute truth - all it can do is make you say what you believe to be the truth. If Gaylord believed himself to be Jorge's father, then he would say that under the truth serum, even if it ultimately turned out not to be the case.
Tailkinker ★
Gaylord (Greg) was also drunk when he went on his monologue of spilling "secrets" about others in the room.