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)
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)
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)
Continuity mistake: In the motor coach, when Greg takes the milk from the fridge, the window shade behind Little Jack keeps moving up and down between shots. (00:14:40)
Continuity mistake: When Greg accidentally drinks milk from little Jack's nutrition supply, he spits out the milk and it dribbles down his chin when Jack tells him it's from Debbie's left breast. Greg wipes some of it off, then In the next shot, he turns around and all the milk is gone - the shot changes so quickly there wasn't enough time for Greg to wipe off the milk. (00:15:25)
Continuity mistake: During the fondue dinner, Little Jack is in his crib, which is right next to the table between Dina and Jack. Then in the next couple of shots the crib is gone, it then reappears again at various times with and without LJ. (00:38:30)
Continuity mistake: In the scene where the two sets of parents meet for the first time on the island, Bernie hugs Greg leaving his sweat mark on Greg's shirt which also looks wrinkled. This changes to there being no wetness at all, some wetness and then very wet again in between shots of him. When he enters the house, his t-shirt is totally smooth and dry. (00:21:25 - 00:23:20)
Continuity mistake: When everyone goes to town Greg stays behind to babysit. Just before he goes to check on a crying LJ be pauses outside the door and the shot shows a close up of a pair of running shoes that are different than the ones Greg is wearing during the remaining scenes. In the shot by the door, the shoes are light grey and white with a metal plate on the side, however, in the rest of the scenes he has on navy and white running shoes. (01:01:50 - 01:03:00)
Continuity mistake: When Greg is talking on the microphone towards the end, it appears in his hand. However, the next time he pops it off the stand, it makes a loud noise that wasn't there the first time.
Continuity mistake: During the party at the Good Times Supper Club, when Jack holds out Dina's wine spritzer, in the shots facing Pam the drink has a deep golden color, but in the shots facing Jack the drink is clear. The straw, lime, etc change as well. (01:21:10)
Continuity mistake: There are two sofas in the Fockers' living room, the large whose back faces the kitchen and small whose back faces the "wall of Gaylord"; their pillows have coordinating large and small floral patterns on both sides. When Greg brings crying LJ into the living room, the three pillows on the small sofa have the small pattern facing out, but after Greg answers the phone call from Roz, Jinxy releases LJ, and in the close-ups of LJ the large pattern faces out. Then, when Greg rushes in with his rum surprise, in the first pan of the empty room the small pattern faces out, yet when LJ sits with his glued hands the large pattern faces out. (01:06:00)
Continuity mistake: Whilst speaking to Pam at their apt, Greg lifts the luggage off the counter. In the first shot, the front zippered pocket faces him, but in the next shot it faces the opposite way - away from him. (00:03:20)
Continuity mistake: At his apartment, when Greg walks over to the laptop things on the desk change position, such as the bowl, which goes from being two feet to the right of the laptop, to directly behind it in the close-up, then back again. (00:02:30)
Continuity mistake: After the Byrnes meet the Fockers and retreat back to their motor home, Dina, standing in front of Little Jack says "they seem like very nice people." Little Jack has his laptop all the way down by his feet. Jack then runs over when he thinks LJ has spoken his first word and you now see the computer up by his chest and some sort of small equipment appears on the seat next to LJ. It looks like maybe a cellphone or seat belt buckle. (00:34:07 - 00:34:17)
Answer: Muskrat is a "code word" they use to remind Jack to keep his temper under control.
Myridon